Data inconsistency encountered: recursive component (Spec &1)

What causes this issue?

The component based on specification &V1& is contained in its own
composition. This is inconsistent.

System Response

The product structure is not expanded beyond the second occurance of the
same component.

How to fix this error?

Change the composition of specification &V1& and remove the self
reference. Note that the inconsistency may occur over several levels of
the structure. Therefore, if &V1& is not a direct component of itself,
also check the lower levels of the structure of &V1&.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.