After the invoices in a group are posted, the group will be deleted? If yes, why is there a field called Group in invoice head table?
Yes. And so you can refer back to the group that created it.
How can I refer to back to the group? do i need to do query? Also, once the group is deleted, its name can be reused, would it cause any confusion and conflict?
Yes, it is possible for it to be reused - which could lead to confusion. What info from an AR Inv group do you need to maintain?
We have a customization that auto numbers our groups. The refer back option is to help if you file papers still. Our site files by group number with an edit list and all the invoices in the group. Get the group number get the invoice.