Diagnosis
Variable name '&V1&' has a format which is not allowed. Variable namesmust fulfil the following requirements:

• The name must begin with a letter, and it can only contain letters,
digits, and an underscore.

• The name cannot be identical to a keyword or to the name of an
installed function.

• The name cannot be longer than 20 letters.

Procedure
Alter the variable name so that it corresponds to the requirementsmentioned above.