Sequence group &2&1 must have at least one constraint.
Message type: E = Error
Message class: PROD_ALLOC_SEQUENCE - T100 Messages for BO Product Allocation Sequence
Message number: 021
Message text: Sequence group &2&1 must have at least one constraint.
Self-Explanatory Message
SAP has defined this message as ‘self-explanatory’ and therefore, has not provided any further details for it.
All messages in SAP have a message text (shown above). However, the message text is not always useful enough to understand or resolve the issue.
Therefore, most messages in the SAP system provide additional long text with details about what caused the issue, how it can be resolved, what actions to take or configuration changes to make, etc
Unfortunately, this specific error message does not provide such additional information.
What else can you do?
Even though this error message does not provide any useful or additional message details, you can still try to solve the issue by searching on SAP’s support portal. In many cases, there could be an SAP support note that provides further error explanations or even directions for resolving the error.
Related Error Messages
PROD_ALLOC_SEQUENCE020 Enter an allocation object for constraint &2&1.
PROD_ALLOC_SEQUENCE019 Allocation obj. &1 cannot be assigned to different groups: &4&2 and &4&3.
PROD_ALLOC_SEQUENCE022 The validity period must end later than it starts in constraint &2&1.
PROD_ALLOC_SEQUENCE023 Enter a lead time duration greater than/equal to 0 for constraint &2&1.