Message type: E = Error
Message class:  FKK_ID_XX_ODN - ODN message 
Message number: 136
Message text: &1 doc. classes for ext. numbering must not have number range assignment
In the Customizing activity
<DS:SIMG._FICAOD_DOCCLS_DET>Assign Document Classes to Document Types
and Origin Keys</>, you have specified external numbering for
&SYST-MSGV1& document classes. You therefore cannot assign a number
range to these document classes here.
Your documents may be incorrectly numbered or not numbered at all.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
If you require external numbering for the document classes, remove the
assignment to the number range specified here.
If you require internal numbering using a number range for the document
classes, deactivate external numbering for the document classes in the
Customizing activity
<DS:SIMG._FICAOD_DOCCLS_DET>Assign Document Classes to Document Types
and Origin Keys</>.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message FKK_ID_XX_ODN136 typically occurs in the context of the SAP Convergent Charging or Contract Accounts Receivable and Payable (FI-CA) modules. This error indicates that there is an issue with the document classes that are set up for external numbering. Specifically, it suggests that the document classes you are trying to use are not properly configured with a number range assignment.
Cause: The error is caused by the following reasons: Document Class Configuration: The document class you are trying to use is configured for external numbering but does not have a corresponding number range assignment. Number Range Assignment: The system expects that if a document class is set to use external numbering, it must have a valid number range assigned to it. If this is not set up correctly, the error will occur.
Solution: To resolve this error, you can follow these steps: Check Document Class Configuration: Go to the configuration settings for the document class
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