Find relationship between table PurchRFQReplyTable and AgreementHeader Table or AgreementHeaderDefault Table

Hi,

I need to transfer the information about the Date of Delivery in  module Procurement and sourcing from a reply to request of quotation to purchase agreement. The problem that I could not find a relation ship between Tables: PurchRFQReplyTable and AgreementHeaderDefault. What I tried to do is :

1-add a field with extended data type DlvDate to the Table AgreementHeaderDefault

2-Replace the PurchRFQReplyTable.initAgreementHeaderDefault  method code by this one :

void initAgreementHeaderDefault(AgreementHeaderDefault _agreementHeaderDefault)
{
    _agreementHeaderDefault.DeliveryTerm    = this.DlvTerm;
    _agreementHeaderDefault.DeliveryMode    = this.DlvMode;
    _agreementHeaderDefault.PaymentTerms    = this.Payment;
    /*this is the New Field in AgreementHeaderDefault Table with extended data type DlvDate */
    _agreementHeaderDefault.DefaultAgreementLineDeliveryDate = this.DeliveryDate;

}

3-Create New Relation for the Table AgreementHeaderDefault with the PurchRFQReplyTable with the attached properties.

Unfortunetely, This solution does not work for me. Help please.