It is also stated in the document of the enhancement in SMOD, but I quote anyway:
1. Create a customer exit project using transaction CMOD.
2. Assign the customer exit IPRM0003 to this project.
3. Include your fields in the structure CI_MPOS using the transaction
SE11 (ABAP/Dictionary), if these have not already been defined by
other applications. Note the namespace for fields reserved for
customers.
4. Activate the structure.
Note that a table may contain a maximum of 255 fields. SAP can
include new fields in the table MPOS.
5. Create the screen 0100 in the function group XPRM. The screen must
correspond to the screen type Subscreen.
6. Define the type pool WC (type pools: WC.) in the top Include for the
function group XPRM.
7. Process the components in transaction CMOD:
- Code the function exit EXIT_SAPLIWP3_001 for data transfer of
the SAP application to the screen area.
- Code the function exit EXIT_SAPLIWP3_002 for data transfer of
the screen area to the SAP applications.
- Code the function exit EXIT_SAPLCOIH_030 for data transfer of
the customer-specific fields to the call object "order".
- Code the function exit EXIT_SAPLIWOL_031 for data transfer of
the customer-specific fields to the call object "notification".
- Code the function exit EXIT_SAPLCOIH_032 for data transfer of
the customer-specific fields from the call object "notification"
to a generated order.
Activate the project.
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