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* Transaction CMOD -> Utiliteis -> SAP Enhancements
* Exit Name SUSR0001
* Double click EXIT_SAPLSUSF_001
* Double click ZXUSRU01
* Insert -> include zsesschk.
*
* zsesschk limits the number of login sessions per user
* in a certain client
* It runs from user exit SUSR0001 after the SAP Login
* n-1 is the number of concurrent sessions allowed

TABLES: UINFO.
DATA: N TYPE I VALUE 2.              "Upper limit of login sessions
DATA: OPCODE TYPE X VALUE 2, I TYPE I, A(60).
DATA: BEGIN OF BDC_TAB1 OCCURS 5.
        INCLUDE STRUCTURE BDCDATA.
DATA: END OF BDC_TAB1.

DATA: BEGIN OF USR_TABL OCCURS 10.
        INCLUDE STRUCTURE UINFO.
DATA: END OF USR_TABL.

* Exclude Limit login by Users
IF  SY-UNAME <> 'XXX'
AND SY-UNAME <> 'XXX'.

CALL 'ThUsrInfo' ID 'OPCODE' FIELD OPCODE
  ID 'TAB' FIELD USR_TABL-*SYS*.

LOOP AT USR_TABL.
  IF SY-UNAME = USR_TABL-BNAME AND SY-MANDT = USR_TABL-MANDT.
    I = I + 1.
  ENDIF.

ENDLOOP.

IF I >= N.

A = 'You have already '.
A+17(2) = I - 1.
A+19(25) = 'login sessions in client '.
A+44(4) = SY-MANDT.

  CALL FUNCTION 'POPUP_TO_INFORM'
       EXPORTING
            TITEL = 'UNSUCCESSFUL LOGIN'
            TXT1  = A
            TXT2  = 'You are not allowed to log in'.

  MOVE: 'SAPMSSY0' TO BDC_TAB1-PROGRAM,
          '120' TO BDC_TAB1-DYNPRO,
          'X' TO BDC_TAB1-DYNBEGIN.
  APPEND BDC_TAB1.CLEAR BDC_TAB1.
  MOVE: 'BDC_OKCODE' TO BDC_TAB1-FNAM,
         '/nex' TO BDC_TAB1-FVAL.
  APPEND BDC_TAB1.CLEAR BDC_TAB1.

  CALL TRANSACTION 'SM04' USING BDC_TAB1 MODE 'N'.

ENDIF.
ENDIF.