a collection ‘products’ needs except the ID also an Id-number that is equal to the ID
'product_ID': text
'productNr': number 'ID'
therefore in migration.alan below line is added
'productNr': number = to-number <! !> $ .'product_ID'
when a products needs to be is added however, then ‘productNr’ must be filled, what is not wanted, it should be filled automaticly.
How to get this done?