Added the field dispute code for posting the purchase invoice so that it is set in the vendor ledger entry

Dispute code on Purchase Invoice:

On the purchase invoice and purchase order the field Dispute code has been added. This field is used to define the reason why an invoice shouldn't be paid.

In the past this had to be added after the posting of the invoice. Now it can be determined before posting and the value of the dispute code is taken over to the vendor ledger entries.

The value of the On Hold field is filled based on the On Hold field of the dispute code.