Set & and table field & do not match

What causes this issue?

The set you entered, &v1&, has a different dimension than its table
field, &v2&. The set has dimension &v3&, while the table field has
dimension &V4&.

System Response

The system will not accept your entry.

How to fix this error?

Either use a set with the matching dimension, &v4&, or choose a table
field that matches dimension &v3&.

Error message extract from SAP system. Copyright SAP SE.