AR Transactions Document Numbers

Hi
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I need to assign document sequencing for AR Transactions and should be continue for all Transactions irrespective for Transaction source or Transaction type

 

For eg. I may have 4 Difference Transaction sources and the number should be serially numbered for all

and should not be separate sequencing

 

                Transactions Type                           Document Number generation

                Transaction type A                          1

Transaction type B                           2

Transaction type C                           3

Transaction type D                          4

 

Rgds
Parveen