Cannot update customer master via xd99

Hi,

I am unable to update customer master via XD99 (mass change) transaction. When I use the transaction XD99 to update customer master we get the following error. I am updating the customer group field (KNVV-KVGR1). No batch input data for screen SAPLV02Z 9998

Message no. 00344

I tried updating the name1 field and its updating this via XD99.

Does any one know how to solve this issue?

Kind Regards,

Rabbiya