Coding block can be extended in classic GL as well as in new GL. In new GL, you extend the coding block and then add the field to the totals (FAGLFLEXT) table. SAP recommends that you should check whether a suitable standard SAP coding field already exists that fulfills your requirements. If this is the case, use that field, otherwise create a new coding field.
As soon as a client has been flagged as productive in a system, the function Include fields is locked for that system. So you first have to unflag your productive system as productive (T Code SCC4 - check with your Basis Team) and then ship coding block extension to your productive system. This is highly risky and you need to find a window when no postings are occurring in your productive system or lock the system for users during that time frame.
The system adds the newly included coding fields to the existing ABAP Dictionary tables. Changes to the ABAP Dictionary tables can, in the case of errors, lead to a loss of data. Carry out a backup before you insert coding fields.
During the execution of these Dictionary operations no other users should be working in the system. Any other users working in parallel in the system could be hampered by the DDIC activities.
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