S4/hana ME21N create Po output control message button missing solution (switch EDI output mode brf+ to Nast mode)

=> The switching method can be directly seen in the chapter 3

1. problem

• S4/HANA Use ME21N establish PO No output control message button
  
• menu bar ： go to -> news (Ctrl + F9) It's gray
  

2. reason

• S4/HANA Use new BRF+ Pattern , Not the old NAST Pattern ; In the new BRF+ In case of output , Output by the system according to SRPO and OPD Custom settings in settings trigger , When created, it will not trigger
• S4/HANA The new version is recommended BRF+ function , You can also switch to old through configuration NAST edition
• Reference resources Note：2689258 - S/4HANA Output Control: Print Preview & Messages buttons are missing in ME21N screen (and similar symptom can occur for other purchasing documents as well)

3. terms of settlement

• Reference resources Note：2344602 - Is it possible to use the NAST output logic in S/4 HANA instead of default S/4HANA Output Control in purchasing documents?
• Switch BRF+ Mode to old NAST Pattern
  • SM30->APOC_I_OBJ_TYPEV（ surface ：APOC_I_OBJ_TYPE）
    
  • Set the application type you want to switch Historical output control = NAST Activate mode = 1
    
  • SPRO-> Cross application components -> Output control -> Manage application object type activation （ Transaction code ：S_ER9_68000026）
    
  • Set the application type you want to switch state = 2
    
  • SM30->MMPUR_OUTP_CTRLV
    
  • Select the program type you want to switch Pattern = 1
    

4. see NAST Whether the switch is successful

• Run the transaction code ：ME21N; The old output control message button shows that the switching is successful