D365F&O - X++ - Get datasource in modified method COC in form control extension

[ExtensionOf(formControlStr(CustFreeInvoice, OrderAccount))]
final class CustFreeInvoiceOrderAccount_Extension
{
    public boolean modified()
    {
        Boolean ret = next modified();
        FormControl formControl = any2Object(this) as FormControl;
        FormDataSource custInvoiceTable_ds =
            formControl.formRun().dataSource(tableStr(CustInvoiceTable));
        custInvoiceTable custInvoiceTable = custInvoiceTable_ds.cursor();
       

        if (CustInvoiceTable.RecId == 0)
        {
            ret = true;
        }
        custInvoiceTable_ds.research(true);
        return ret;
    }
} 

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