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How to give multiselection lookup in Form level

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Hi Folks,

Need to give a Multiselection option in a field of a custom form.

I have created a field with string size 1000 and created a Lookup method of Data field control level

public void lookup()
{
    //super();
  
    container conLookup;

    Query query = new Query(tableStr(CompanyInfo));

    QueryBuildDataSource queryBuildDataSource = query.addDataSource(tableNum(CompanyInfo));
    queryBuildDataSource.addSelectionField(fieldNum(CompanyInfo, DataArea));
    queryBuildDataSource.addSelectionField(fieldNum(CompanyInfo, Name));

    conLegalEntity = [tableNum(CompanyInfo), fieldNum(CompanyInfo, DataArea)];


    SysLookupMultiSelectGrid::lookup(query,
                                this,
                                this,
                                this,
                                conLegalEntity);
}

But now the issue is multiselection option is coming in the lookup but it is not showing in the field value after selection i.e No selected value is populating in the field value.

How can I fixed this issue

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Waed Ayyad 9,212 Super User 2026 Season 2 on at

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Hi,

You should set the value on the modified method of the lookup field, check the following links:
https://community.dynamics.com/blogs/post/?postid=1c4642c9-19be-43aa-847a-b396252f90f6
https://erpdax.wordpress.com/2022/03/24/multiselect-lookup-in-d365-fo/

Thanks,
Waed Ayyad

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Waed Ayyad 9,212 Super User 2026 Season 2 on at

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Hi,

Is your issue resolved? If yes, mark the answers that helped you as verified.

Thanks
Waed Ayyad

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D365FO Avatar 672 on at

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Can you please suggest what need to be done in case of custom form and another approach which you have shared.

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Waed Ayyad 9,212 Super User 2026 Season 2 on at

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Hi,

You can follow the same concept in the following link: Multi select lookup in D365 FO (dynamics.com) but instead of using COC and Event handler you will add your code directly on the init method of the form and modified method of your multi lookup control.

Follow it and tell me if you faced any issue.

Thanks,
Waed Ayyad

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D365FO Avatar 672 on at

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I have added all the method which is given in the link, here also multiselection option is coming but the selected value is not populating.
I have debugged and checked at time of selection in field, modified method is not triggering.
[DataSource] class dataSource { [DataField] class fieldName { public void modified() { // super(); dataSource.fieldName = con2Str(msCtrl.getSelectedFieldValues(), ';'); } } }

Please suggest me what can be the issue

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Waed Ayyad 9,212 Super User 2026 Season 2 on at

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Hi,

Try to do full build for your model. Also did you add third step: "3. Create a parm method to hold the multilookupSelectCtrl object" and did you set the value of the parm method on the init method? Can you share the code ?

Thanks,
Waed Ayyad

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D365FO Avatar 672 on at

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[Form] public class abcForm extends FormRun { public SysLookupMultiSelectCtrl msCtrl; public Query buildLegalEntityQuery() { Query query = new Query(queryStr(abcQuery)); return query; } container buildLegalEntityQuery(DataAreaId _legalEntityStr) { CompanyInfo legalEntity; container tmpValues, conIds, conName; int idx; if(_legalEntityStr) { tmpValues = str2con(_legalEntityStr, ';'); } for(idx=1; idx<=conLen(tmpValues); idx++) { legalEntity = CompanyInfo::findDataArea(conPeek(tmpValues, idx)); conIds += legalEntity.DataArea; conName += legalEntity.Name; } return [conIds, conName, conIds]; } public void init() { Query legalEntityQry = this.buildLegalEntityQuery(); super(); msCtrl = SysLookupMultiSelectCtrl::construct(this, Grid_LegalEntity, queryStr(abcQuery), false, [tableNum(CompanyInfo), fieldNum(CompanyInfo, DataArea)]); msCtrl.refreshQuery(legalEntityQry); msCtrl.set(this.getSelectedLegalEntity(abcTable.LegalEntity)); } [DataSource] class abcTable { [DataField] class LegalEntity { public void modified() { // super(); abcTable.LegalEntity = con2Str(msCtrl.getSelectedFieldValues(), ';'); } } } }

Hi Waed Ayyad

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Waed Ayyad 9,212 Super User 2026 Season 2 on at

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Hi,

Did you define this method getSelectedLegalEntity? Where is the definition of it? Also did the build run without any errors?

Thanks,
Waed Ayyad

If this helped, please mark it as "Verified" for others facing the same issue

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Waed Ayyad 9,212 Super User 2026 Season 2 on at

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Hi,

Is your issue resolved? If yes, mark the answers that helped you as verified.

Thanks
Waed Ayyad

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D365FO Avatar 672 on at

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I have did the same way mentioned in the Blog you shared.

Could you please let me know how I have to define it?

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