RE: Generate check numbers with ER configuration on Method of payments.
Ok, what you are asking is a bit tricky but doable. You have to create the logic that the system does with code but with ER.
I don't know that exact logic, but I would think that the system modifies the registers from bankchequetable and marks them as send, maybe even updates fields like voucher and transdate. If you are not a programmer you should ask one what the system does.
In the format you must have a list of transactions (from the ledgerJournalTrans), each with a field with his checknumber, that's something you have calculated in the fly starting from the "next" that you got from the method.
Now you need a new model root in the same model you are using in the format. Something like:

map it to the destination (import)

In the designer and then the model mapping add it to the datasource:

Add the bankchequetable in the destination:

bind them (you may need more fields):

From here you need to create a "callback" in the format and select the import definition you've created:

Add the import definition

And bind them (I'm using a test format, you must have a record list)
