Diagnosis
The block scheme &v1& is in the SAPnamespace. If you modify this object, these modifications may possiblybe overwritten by a future version.

Procedure
If this is a preliminary correction, the warning may be ignored.
Otherwise, you should copy the block scheme into the customer namespace(without leading "/") and modify it there. Then the entries of theblock scheme need to be changed in the properties of the stock ledgergroups.