Please enter a version number

What causes this issue?

The version number identifies the material group tree that is/was
changed by a reclassification.

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?

Please enter a version number under which the new material group
hierarchy is stored until the physical reclassification.

Error message extract from SAP system. Copyright SAP SE.