No. of fields in repository structure &1, no. of fields in segment &2

What causes this issue?

The number of fields in the segment is '&v2&'. In the repository
structure, however, there are '&v1&' fields.

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 compare the segment structure with the appropriate repository
structure of the same name. In the segment editor, change the structure
in accordance with your requirements and save.

Error message extract from SAP system. Copyright SAP SE.