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Free text invoice Lines are duplicating each time i click on OK btn for credit invoicing - D365FO

Hi, im facing an issue with invoice lines in FTE form.

when i create a new customer and wants to add new credit invoicing, its coming correct for first time.

Now if i click again on the credit invoicing and click on OK again, the line will be duplicated.

here is my code:

----

[ExtensionOf(formControlStr(CustVendCreditInvoicing, OK))]
final class CustVendCreditInvoicing_Ok_Extension
{
public void clicked()
{
Common callerTable1;
CustInvoiceTable _custInvoiceTableOld, custInvoiceNew;
CustInvoiceLine _custInvoiceLineOld, _custLineNew;

FormRun formRun;
callerTable1 = element.args().record();
formRun = element.args().caller();
FormStringControl _cntrStr = this.formRun().design().controlName(/CustVendCorrectedInvoiceId/);

str invoiceid = _cntrStr.text();

next clicked();

if(callerTable1.TableId == tablenum(CustInvoiceTable))
{
custInvoiceNew = callerTable1;
}
ttsbegin;
select _custInvoiceTableOld where _custInvoiceTableOld.InvoiceId == invoiceid;

custInvoiceNew.DocumentDate = _custInvoiceTableOld.DocumentDate;
custInvoiceNew.ReleaseDate = _custInvoiceTableOld.ReleaseDate;
custInvoiceNew.InclTax = _custInvoiceTableOld.InclTax;
custInvoiceNew.WorkerSalesTaker = _custInvoiceTableOld.WorkerSalesTaker;
custInvoiceNew.CustomerRef = _custInvoiceTableOld.CustomerRef;
custInvoiceNew.ContactPersonId = _custInvoiceTableOld.ContactPersonId;
custInvoiceNew.Payment = _custInvoiceTableOld.Payment;
custInvoiceNew.PaymMode = _custInvoiceTableOld.PaymMode;
custInvoiceNew.CustBankAccountId = _custInvoiceTableOld.CustBankAccountId;
custInvoiceNew.PaymentSched = _custInvoiceTableOld.PaymentSched;
custInvoiceNew.CashDiscCode = _custInvoiceTableOld.CashDiscCode;
custInvoiceNew.DirectDebitMandate = _custInvoiceTableOld.DirectDebitMandate;
custInvoiceNew.DefaultDimension = _custInvoiceTableOld.DefaultDimension;

custInvoiceNew.update();

ttscommit;

ttsbegin;

while select _custInvoiceLineOld where _custInvoiceLineOld.ParentRecId == _custInvoiceTableOld.RecId
{

_custLineNew.clear();
_custLineNew.initValue();
_custLineNew.ParentRecId = custInvoiceNew.RecId;
_custLineNew.Description =_custInvoiceLineOld.Description;
_custLineNew.LedgerDimension = _custInvoiceLineOld.LedgerDimension;
_custLineNew.TaxGroup = _custInvoiceLineOld.TaxGroup;
_custLineNew.TaxItemGroup = _custInvoiceLineOld.TaxItemGroup;
_custLineNew.TaxWithholdGroup = _custInvoiceLineOld.TaxWithholdGroup;
_custLineNew.TaxWithholdItemGroupHeading_TH =_custInvoiceLineOld.TaxWithholdItemGroupHeading_TH;
_custLineNew.Quantity = - _custInvoiceLineOld.Quantity;//negataive value
_custLineNew.UnitPrice = _custInvoiceLineOld.UnitPrice;
_custLineNew.AmountCur = - _custInvoiceLineOld.AmountCur;//negative value
_custLineNew.DefaultDimension = _custInvoiceLineOld.DefaultDimension;
_custLineNew.insert();
}
ttscommit;

if(formrun)
{
formrun.doResearch(); // Force all parent form data sets to refresh
}

}

any idea how to fix this issue?

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