InfoObject & contains invalid characters in record & in value &

What causes this issue?

To guarantee the consistency of the InfoCube, you are not allowed to use
lowercase letters and certain special characters in the specified
InfoObject.
The BW Customizing Implementation Guide tells you how to maintain
permitted additional characters.

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?

In the specified record, check the corresponding field for
capital/lowercase letters, special characters that are not permitted,
the plausibility of date and time entries, and the correct observance of
the ALPHA conversion routine. Correct the field contents accordingly.
Restart the load process.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.