Field help (PBPREFIX) 

Use this field to define the budget code prefix/suffix to apply to the selected destination budget codes (budget table field Destination code).

 You must click the Apply action to apply the defined budget code prefix/suffix to the destination budget codes. The field Destination code displays the new value.

The sequence number Assignment function (GESTCA) defines the sequence number which is used for budget codes. If the BDG - Budget code sequence code is not set up to permit manual entries the budget code prefix/suffix is not copied to the destination budget codes.