If a different deadline for payment is set in the document than is actually found with the corresponding item:

• If you are typing in the first document line, change payment deadline to the one set in the price list.
• If document you are creating already includes the lines, thus not allowing you to change payment deadline, the following message is returned.

The above mentioned message is therefore returned in the following attempts of entry of invoices received or issued:

• If payment deadline is entered in customer price list that differs from the deadline entered in the header of invoice issued. 
• If payment deadline is entered in supplier price list that differs from the deadline entered in the header of invoice received. 

Close the window clicking .

Solution:

1. Open a new document for items having a different due payment.

2. If you do not wish to use this functionality, set payment deadline for customer to "-1" - do not check.