406 SAP Message of Class B1 Assignment not allowed

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406(B1) - Assignment not allowed

Message number 406 of class B1 is used to display message "Assignment not allowed" and can be triggered using the following ABAP code:

    MESSAGE W406(B1). "Warning message example
    MESSAGE I406(B1). "Information message example
    MESSAGE E406(B1). "Error message example
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What causes this issue

The assignment of message type to IDoc type for ALE must be one of
the allowed assignments between message type and IDoc type.

How to fix

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Message text extract from SAP system. Copyright SAP SE.

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