FUNL0211 Nonsense IF condition due to (explanation).

A condition in an IF or ELSEIF statement is illegal, and the explanation is shown in the message as explanation.

For example, a test such as

+%X IS FLOAT

will be rejected with the explanation "type comparison against forced type", because using "+" to obtain the float value of "%X" would always give a float value. If you were using such a statement to determine whether the value of %X conformed to a float value, use the above test without the "+".