Receivables Receipt Batch Numbering

Hi,

Receivables receipt batch numbering is set up as automatic on the receipt batch source, so batches get a number automatically. However, the batches receive a new number when users change the count or amount on the batch and than save it. Do you know why this is happening? Is this controlled by a system profile option? Can this be changed, so that batch keeps the original number?

Thanks & regards, Zsolt