i just want some customers to be allowed by account group for a particular sales document type if other customers comes error has to come after entering sold-to-party by pressing enter while creating in va01.
It is possible with standard-Don't go for enhancement..Try with customer Blocks along with document blocks(IMG>>SD>>Sales>>sales Documents>>Define & assign reasons for blocking-You need to assign the same to your customer+ sales doc type)
Only limitation here is-You need to extract the customers list pertaining to account group & proceed further..
Phanikumar