To indicate the presence of a verify exit routine, specify its address on the IKJUNFLD macro instruction. When the Parse Service Routine encounters a keyword operand or subfield operand in the command buffer that is not specifically defined in the PCL, it determines whether a PCE has been created by the IKJUNFLD macro instruction. If parse encounters such a PCE, it gives control to the verify exit routine; if it does not, the operand is treated as not valid. The Parse Service Routine uses only the first specification of the IKJUNFLD macro instruction when unidentified keyword operands are present in the command buffer. Similarly, parse uses only the first specification of the IKJUNFLD macro instruction within a subfield specification when an unidentified keyword is present within a subfield. Using verify exit routines describes what you must do to provide verify exit routines.