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Retrieve value of a field given by a display method

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Posted on by FabFab97

Hi everyone, I'm new in d365 and I'm having some issues with my task because of a display method.
I am in the form LedgerJournalTransVendInvoice, where I have the field 'Total Amount'. Cheking the properties of the field I can see it's a calculated field connected to the method totalAmountSingleLine. This method is a display method in the DataSource of my form, and of course the display method in the end returns the TotalAmount that I need in my project in order to confront it with another field called RemainingAmount. Any suggestion on how can I do it? I tried several ways but nothing seems to work properly.

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Layan Jwei 8,097 Super User 2025 Season 2 on at

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Hi Fabrizio,

can you please explain more what do you need to do with RemainingAmount and TotalAmount? and show us please the code that you tried so that we can understand what are you trying to do.

Thanks,
Layan Jweihan

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FabFab97 71 on at

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Hi @Layan Jwei,

Sure, sorry if I haven't been clear. In my project I need to display a pop up when, posting a new journal, the TotalAmount of that specific journal is higher of the RemainingAmount of the specified client, as reported on the intent letter. For example If the remaining amount on the intent letter of a client is 100 and I'm posting a journal with a total amount of 1000, it should stop the registration of the journal and the pop up alert should appear. The remaining amount is on the intent letters form, and is a normal field of the intent letters table, while the Total Amount is a calculated field given by the method totalAmountSingleLine found on the form datasource, I can see its code if I look on the class of the form at least, and it's a display method. This is the code I wrote by now, looking on internet for a solution to my problem:
[ExtensionOf(formControlStr(LedgerJournalTransVendInvoice, PostJournal))] final class LedgerJournalTransVendInvoice_PostJournal_AzimutBenetti_Extension { public void clicked(){ IntentLetter_IT intentLetter; FormButtonControl formButtonControl = any2Object(this) as FormButtonControl; FormDataSource formDataSource = formButtonControl.formRun().dataSource(tableStr(LedgerJournalTrans)); LedgerJournalTrans ledgerJournalTrans_ds = formDataSource.cursor(); if(ledgerJournalTrans_ds.totalAmountSingleLine() > intentLetter.remainAmountMST()){ DialogButton diagBut; str strMessage = "Importo da decurtare al saldo della lettera di intento maggiore dell’importo residuo. Proseguire?"; str strTitle = "Splafonamento"; diagBut = Box::yesNo( strMessage, DialogButton::No, strTitle ); next clicked(); } }

and I keep getting this error: Error ClassDoesNotContainMethod: Table 'LedgerJournalTrans' does not contain a definition for method 'totalAmountSingleLine' and no extension method 'totalAmountSingleLine' accepting a first argument of type 'LedgerJournalTrans' is found on any extension class.
I hope it's more clear now,
Thank You.

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Bharani Preetham Pe... 3,634 Moderator on at

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If you want to use a display method, then you need to recreate same SQL statement like a view or if you are using it in any data entity then you have to use computed columns. Please tell us complete requirement.

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FabFab97 71 on at

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if it can be helpful in any way, I'll post here also the content of the display method:
[Form] public class LedgerJournalTransVendInvoice extends FormRun implements TaxIFormShowTax, IFormRefreshable, LedgerILedgerJournalEngineProvider, LedgerIJournalFormRefreshable, LedgerIJournalFormCache, LedgerIJournalCashDiscount, OfficeIMenuCustomizer, OfficeITemplateCustomExporter, LedgerIJournalForm { [DataSource] class LedgerJournalTrans {display Amount totalAmountSingleLine(LedgerJournalTrans _ledgerJournalTrans) { TaxAmountCur signedActualTax; Amount totalAmount, taxAmount, transactionAmount; transactionAmount = _ledgerJournalTrans.amount(); if (TaxSolutionScopeIntegrationUtil::isCompanyEnabled()) { TransTaxInformation transTaxInformationLoc = TransTaxInformationHelper::findOrCreateTransTaxInformationByRecord(_ledgerJournalTrans); if (transTaxInformationLoc && !transTaxInformationLoc.InclTax) { ITaxDocument taxDocument = TaxBusinessService::calculateTax(TaxableDocumentObject::construct(TaxableDocumentDescriptorFactory::getTaxableDocumentDescriptor(_ledgerJournalTrans))); if (taxDocument) { ITaxDocumentLine taxDocumentLine = taxDocument.findLineBySource(_ledgerJournalTrans.TableId, _ledgerJournalTrans.RecId); if (taxDocumentLine) { taxAmount = abs(taxDocumentLine.getLineTax().amountTransactionCurrency()); } } } } else if (!ledgerJournalTable.LedgerJournalInclTax) { if (_ledgerJournalTrans.TaxCode) { return transactionAmount; } LedgerJournalEngine ledgerJournalEngineVendInvoice = LedgerJournalEngine::construct(ledgerJournalTable.JournalType); ledgerJournalEngineVendInvoice.ledgerJournalTable(ledgerJournalTable); taxAmount = ledgerJournalEngineVendInvoice.correctedTaxAmount(_ledgerJournalTrans); if (_ledgerJournalTrans.TaxGroup && _ledgerJournalTrans.TaxItemGroup && _ledgerJournalTrans.AccountType == LedgerJournalACType::Vend) { signedActualTax = ledgerJournalEngineVendInvoice.parmActualTax(); if ((transactionAmount > 0 && signedActualTax > 0) || (transactionAmount < 0 && signedActualTax < 0)) { taxAmount = -taxAmount; } } } if (transactionAmount > 0) { totalAmount = transactionAmount + taxAmount; } else { totalAmount = transactionAmount - taxAmount; } return totalAmount; } } }

Of course the entire code is much bigger with lots of more methods, but I don't think the rest is important for my issue, here you can see the form, the datasource and the display method, as displayed in the image on my first answer

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Anthony Blake 2,926 Super User 2025 Season 2 on at

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in this line:

if(ledgerJournalTrans_ds.totalAmountSingleLine() > intentLetter.remainAmountMST()){

you need to pass a buffer of type LedgerJournalTrans to your display method, this is always the case for form data source display methods, see the definition here:

display Amount totalAmountSingleLine(LedgerJournalTrans _ledgerJournalTrans)

in here you need the record buffer:

if(ledgerJournalTrans_ds.totalAmountSingleLine(ledgerJournalTransBufferGoesHere) > intentLetter.remainAmountMST()){

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FabFab97 71 on at

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Thank you,
Sorry but I've never used or heard about buffers in D365, can u tell me where can I find it?
I'm also trying to use an Event Handler OnModified in order to get the value of the field, but I can't do it neither

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Anthony Blake 2,926 Super User 2025 Season 2 on at

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Buffers are a whole other subject to the error you have posted.

High level - its a structure to hold an object representing a table row.

There's loads of reading (and practising!) to do to understand, have a read and create some runnable classes to try things out.

Example of X++ buffers, first result of a popular search engine https://supremexpp.wordpress.com/2018/12/13/x-pitfalls-lesson-1-table-buffers/

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Layan Jwei 8,097 Super User 2025 Season 2 on at

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Hi Farbizio,

I think you need to use "Object" -- I'm not sure if this will work, but maybe give the below code a try: (i amended your code alittle)

[ExtensionOf(formControlStr(LedgerJournalTransVendInvoice, PostJournal))] final class LedgerJournalTransVendInvoice_PostJournal_AzimutBenetti_Extension { public void clicked() { IntentLetter_IT intentLetter; FormDataSource ledgerJournalTrans_ds = this.formRun().dataSource(tableStr(LedgerJournalTrans)); LedgerJournalTrans ledgerJournalTrans = ledgerJournalTrans_ds.cursor(); Object dataSourceObject = ledgerJournalTrans_ds; if(dataSourceObject.totalAmountSingleLine(ledgerJournalTrans) > intentLetter.remainAmountMST()) { DialogButton diagBut; str strMessage = "Importo da decurtare al saldo della lettera di intento maggiore dell’importo residuo. Proseguire?"; str strTitle = "Splafonamento"; diagBut = Box::yesNo( strMessage, DialogButton::No, strTitle ); } next clicked(); } }

Thanks,
Layan Jweihan
Please mark this answer as "Verified" if it solved your issue. In order to help others who will face a similar issue in the future

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Waed Ayyad 9,039 Super User 2025 Season 2 on at

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Hi @ Fabrizio,

You can try this code but make sure to change your display method to have the table record as a parameter.

[ExtensionOf(formDataSource(LedgerJournalTransVendInvoice, LedgerJournalTrans))]
final class LedgerJournalTransVendInvoiceFormDS_Extension
{
display Amount totalAmountSingleLine(LedgerJournalTrans _ledgerJournalTrans)
{
Amount yourAmount;
// your logic
return yourAmount;
}
}

[ExtensionOf(formControlStr(LedgerJournalTransVendInvoice, PostJournal))] final class LedgerJournalTransVendInvoice_PostJournal_AzimutBenetti_Extension { public void clicked() { IntentLetter_IT intentLetter; FormDataSource ledgerJournalTrans_ds = this.formRun().dataSource(tableStr(LedgerJournalTrans)); LedgerJournalTrans ledgerJournalTrans = ledgerJournalTrans_ds.cursor(); if(ledgerJournalTrans_ds.totalAmountSingleLine(ledgerJournalTrans) > intentLetter.remainAmountMST()) { DialogButton diagBut; str strMessage = "Importo da decurtare al saldo della lettera di intento maggiore dell’importo residuo. Proseguire?"; str strTitle = "Splafonamento"; diagBut = Box::yesNo( strMessage, DialogButton::No, strTitle ); } next clicked(); } }

Regards

Waed Ayyad

Please mark this answer as "Verified" if it solved your issue. In order to help others who will face a similar issue in the future

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FabFab97 71 on at

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Thank you all for your suggestions, I tried everyithing you wrote but nothing seems to work. It's like the class of the form is invisible to my module. so It gives me error anytime I call LedgerJournalTransVendInvoice. I tried with other forms and tables and i manage to get the methods i wanted to, but not in this one

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