DN Alloc Seq 0 is not allowed with TCM = SW (Single WellCompletion )

What causes this issue?

Sequence 0 in the Delivery Network Allocation Profile is not allowed
when the Theoretical Calculation Method for that major product is 'SW'
Single Well Completion.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.