RFC function module Maximum number of GUI windows reached error

[xxl_test]

Hello, When I use the function, it returns successfully, but it gives an error that the maximum number of gui windows has been reached. It only gives when I use this function.

There is no such problem when I look at other systems.
CALL FUNCTION ... STARTING NEW TASK the same problem happened.

rdisp/max_alt_modes parameter 16 on the system.

  CALL FUNCTION '/SCWM/TO_CREATE_WHR'
        EXPORTING
          iv_process     = '2'
          iv_lgnum       = mv_lgnum
          iv_mve_hu      = abap_true
          iv_mve_mat     = space
          iv_mve_hu_mult = space
          iv_squit       =  mv_internal
          iv_to_init     = abap_true
          iv_bname       = sy-uname
          iv_wtcode      = space
          it_create_whr  = mt_pull[]
          iv_commit_work = abap_true
        IMPORTING
          ev_tanum       = lv_tanum
          et_ltap_vb     = lt_ltab_vb
          et_bapiret     = lt_return
          ev_severity    = lv_severity.

what is the solution? how can i do it?

Thanks in advance.

ABAP Development Basis Technology EWM - Basic Functions