Field help (CDAAMTMAX) 

This field can only be accessed for the payment attributes with a Bank <=> Account or Account <=> BP structure.
They are used to run a control of the threshold amount in value. The payment line calls the payment attribute with respect to the payment due date to which it is allocated.
This prevents for instance an early discount to be higher by 10€ than the open item to which it is allocated.
The amounts are expressed in the currency defined in the CURSHRFLD parameter.