My client would like to segregate the transaction records of customer (ie XD01) by type of customer.
Would you know what is the object that is capable to manage that?
This is really a Security question. You Security expert could've run a system trace to find which authorization objects are checked in this transaction. Also they could've simply searched in SU21 transaction. Then they would've found F_KNA1_GRP object (I'm assuming you mean Account Group by "client type").
Please do some search before posting and post in the appropriate forum.