261. INVALID ARGUMENT FOR @RELEASE().  ARGUMENTS MUST BE A SINGLE VARIABLE REFERENCE, E.G., @RELEASE( X).

The @RELEASE() statement is used in calc sections to release a variable that was previously fixed so it may once again become optimizable.  To release an entire attribute, place the @RELEASE() reference in an @FOR() loop, e.g.,  @FOR( SET( I): @RELEASE( X( I))).