There are so many reasons a PTF may require special processing that it is impossible to document how you should handle each case. Any PTF requiring special processing should contain a ++HOLD statement (after all the ++VER statements and before the first element MCS). That ++HOLD statement should be as follows:

 
++HOLD(sysmod-id)           /* Originating SYSMOD ID.   */
      SYSTEM                /* Special processing info. */
      FMID(sysmod-id)       /* Functional owner.        */
      REASON(reason-id)
      COMMENT(….
              ….any amount of comment text
              ….
             )
      .