Document type Authorisation in FBL1N

Hi Friends,

We have one requirement to restrict the Document type authorization in FBL1N for one user.

Since in SAP we have created the employee as the Vendor so we are passing the salary voucher vendor wise.

We have tried to check the the authorization object through SU24 for transaction code FBL1N and found the F_BKPF_BLA after that, one authorization group is assigned to Document type in OBA7. there after, in table TBRG the authorization group has been assigned to authorization object. Now that authorisation group is being removed from the user id.

but the same is not working.

Please help.

Thanks in advance !!