Conditional requisites are SYSMODs required only for a particular functional environment. All conditional requisites of each SYSMOD must be resolved. Conditional requisites are specified on the ++IF statement immediately following the applicable ++VER statement. If the function specified in the FMID operand of the ++IF statement is accepted or is being accepted, each SYSMOD specified in the ++IF statement REQ operand must be satisfied. These requisites are satisfied in the same manner as unconditional requisites.

If the function specified in the FMID operand of the ++IF statement is not already installed, these requisites must be satisfied when the function is later installed. SMP/E, therefore, saves the information from the ++IF statement as CIFREQ subentries in the distribution zone SYSMOD entry for that function. When the function is accepted, SMP/E checks the CIFREQ subentries for any requisites of previously accepted SYSMODs and ensures that these requisites are satisfied.