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Error: Form EcoResCategory requires an active buffer

This is a question on Dynamics 365 FO.

I created a field named Classification in the MainAccount form. On the field, I need to create a View Details feature to navigate to the Category Hierarchies form (EcoResCategory). I have written the following code, but I encountered an error saying that /Form EcoResCategory requires an active buffer/. My code is as follow:

internal final class MainAccountExt
{
/// <summary>
/// Add the Lookup Classification field to the MainAccount form.
/// </summary>
/// <param name=/sender/></param>
/// <param name=/e/></param>
[FormControlEventHandler(formControlStr(MainAccount, MainAccount_ADS_Classification), FormControlEventType::Lookup)]
public static void MainAccount_ADS_Classification_OnLookup(FormControl sender, FormControlEventArgs e)
{
Query query = new Query();
QueryBuildDataSource qbds;
QueryBuildRange qbr, qbr1;

FormControlCancelableSuperEventArgs event;
event = e as FormControlCancelableSuperEventArgs;

// Select from EcoResCategory table where the CategoryHierarchy == E-Invoice
qbds = query.addDataSource(tableNum(EcoResCategory));
qbr = qbds.addRange(fieldNum(EcoResCategory,CategoryHierarchy));
qbr.value('68719480517');

qbr1 = qbds.addRange(fieldNum(EcoResCategory, Level));
qbr1.value('3');

// Specify the name of the table the lookup should show data from.
SysTableLookup sysTableLookup = SysTableLookup::newParameters(tableNum(EcoResCategory), sender, true);

// Add field that should be shown on lookup form
sysTableLookup.addLookupfield(fieldNum(EcoResCategory, Code));
sysTableLookup.addLookupfield(fieldNum(EcoResCategory, Name));

// parmQuery() is required to specify the data that should be displayed in the lookup form (dropdown list)
sysTableLookup.parmQuery(query);
sysTableLookup.performFormLookup();

event.CancelSuperCall();
}

/// <summary>
///
/// </summary>
/// <param name=/sender/></param>
/// <param name=/e/></param>
[FormEventHandler(formStr(MainAccount), FormEventType::Initialized)]
public static void MainAccount_OnInitialized(xFormRun sender, FormEventArgs e)
{
FormStringControl formStrCtrl = sender.design().controlName(formControlStr(MainAccount, MainAccount_ADS_Classification));
formStrCtrl.registerOverrideMethod(methodStr(FormStringControl, jumpref), methodStr(MainAccountExt, jumpref), new MainAccountExt());
}

// Jumpref method for View Details function
public void jumpref(FormControl _formControl)
{
MenuFunction menuFunction;
FormRun formRun, targetFormRun;
//Args args = new Args();
Args args;
EcoResCategory ecoResCategory, ecoResCategory2;
//ecoResCategory = EcoResCategory::findByCode(_formControl.valueStr(), 68719480517);
select * from ecoResCategory where ecoResCategory.Code == _formControl.valueStr();
ecoResCategory2 = EcoResCategory::find(ecoResCategory.CategoryHierarchy);
info(strfmt(/EcoResCategory: %1/, ecoResCategory2));

if(ecoResCategory)
{
// Specifying which record the form should display or operate on
args.record(ecoResCategory2);
args.lookupRecord(ecoResCategory2);
menuFunction = new MenuFunction(menuItemActionStr(RetailCategoryDetailsLauncher), MenuItemType::Action);
menuFunction.copyCallerQuery(CopyCallerQuery::Yes);
menuFunction.formViewOption(FormViewOption::Details);
menuFunction.run(args);

//args = new Args(formStr(EcoResCategory));
//args.record(ecoResCategory2);
//info(strFmt(/%1/, args));
//args.caller(formRun);

//menuFunction = new MenuFunction(menuitemDisplayStr(EcoResCategoryHierarchyDetails), MenuItemType::Display);
//menuFunction.run(args);

}
else
{
menuFunction = new MenuFunction(menuItemDisplayStr(EcoResCategoryHierarchyListPage), MenuItemType::Display);
menuFunction.run(args);
}

}

}

I would like to ask what is the active buffer and how to get it. Thank you for any kind helping.

Hi Andreas,

My requirement is I will need to create the Classification lookup field in the Main Account form. The Classification field will display a list of the Code and Name column. The data of Classification lookup field is taken from the Product Category, which is the Category Hierarchies form. There is another requirement that when users right-click the not empty Classification lookup field and select View Details, the users should be navigated to the Category Hierarchies form with the Code selected in the Classification field.

My current progress is I can create the field and its SysLookupField. It is achieved by using the MainAccount_ADS_Classification_OnLookup() method. To create View Details features, I will need to add the Jumpref() method. But it keeps giving me "Form EcoResCategory requires an active buffer" error.

Regards,

Yue Zhen

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