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How to filter the value displayed in the reference group

Hi, I have a question related to Dynamics 365 Finance and Operations.

I created a reference group control in my MainAccount form which will look up to the Category Hierarchies (EcoResCategory) table. In the reference group lookup field, I need it to display only the record where the EcoResCategory.CategoryHierarchy = '68719480517'.

However, when I checked, there is no LookupReference() method for the created reference group control in the MainAccount form code. Hence, I try to use the Chain of Command to extend the MainAccount form code and add a public Common lookupReference() method, but it does not work. The code that I wrote is as follows:

[ExtensionOf(formStr(MainAccount))]
final class MainAccount_Classification_Extension
{
[Control(/ReferenceGroup/)]
class EcoResCategory
{
public Common lookupReference(FormReferenceControl _formReferenceControl)
{
SysReferenceTableLookup sysReferenceTableLookup;
Query query;
QueryBuildDataSource qbds;

sysReferenceTableLookup = SysReferenceTableLookup::newParameters(tableNum(EcoResCategory), _formReferenceControl);
sysReferenceTableLookup.addLookupfield(fieldNum(EcoResCategory,Code));
sysReferenceTableLookup.addLookupfield(fieldNum(EcoResCategory,Name));

query = new Query();

qbds = query.addDataSource(tableNum(EcoResCategory));
qbds.addQueryFilter(qbds, fieldStr(EcoResCategory,Code)).value('!//');

sysReferenceTableLookup.parmQuery(query);
return sysReferenceTableLookup.performFormLookup();
}
}

}

May I know how to resolve it so I can have the reference group field display the records that match my condition only?

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