Field help (KMTVATDCL) 

This field depends on the DCLVATPAY - Manage VAT on collections parameter (CPT chapter, VAT group):

If the field RTZ declared VAT has the value 'Yes', the behavior will be as follows:

If the cheque is represented to collection it is assigned on entry to a payment entered as doubtful:

If the field RTZ declared VAT has the value 'No', the behavior will be as follows: