References to Alphanumeric Items

A function-identifier that makes reference to an alphanumeric function can be specified anywhere that an identifier is permitted and where references to functions are not specifically prohibited, except as follows:
  • As a receiving operand of any statement
  • Where a data item is required to have particular characteristics (such as class and category, size, sign, and permissible values) and the evaluation of the function according to its definition and the particular arguments specified would not have these characteristics.