Billing: Create Custom Outsort Check (Part 2)

1. Create custom function module starts with ISU_VAL_<Biling Validation Name>  with the following parameters:
• Importing
• X_TE327                LIKE TE327
• Changing 
• XY_OBJ                 TYPE ISU2A_BILLING_DATA
• XY_OUTCNSO LIKE ERCHO-OUTCNSO
• Exceptions
• GENERAL_FAULT
2. Validation parameters are set in X_TE327
3. Call FM 'ISU_OUTSORT_IERCHO_WRITE' if needed to outsort the billing document
4. Please refer to the following on how to configure outsorting check groups for billing:
• Billing: Define Outsorting Check Groups for Billing
• Billing: Define Checks per Outsorting Check Group for Billing