Changes not getting captured in MM06E005 of ME22N

Question

Hi,
My requirement is to add an additional tab at Item Level  and a field in that tab. I used the MM06E005 and implemented it. I can see the tab and the field in it at Item level.But when iam making changes in ME22N,the change is not getting Saved.
i created a field   ZZVEND type char in CI_EKPODB .
Created the check box with same field name in Screen Exit  0111  of  MM06E005.
Then i kept the coding in following exits
EXIT_SAPMM06E_016
break-point.
EXIT_SAPMM06E_017
break-point.
EXIT_SAPMM06E_018
break-point.
IF I_UCOMM = 'MESAVE' .
E_CI_UPDATE  = 'X'.
E_CI_EKPO-ZZVEND = EKPO_CI-ZZVEND.
ENDIF.
While running ME22N,its first going into EXIT_SAPMM06E_016 and after checking the ZZVEND i in ME22N ts going to EXIT_SAPMM06E_017.
But i dont see
I_EKPO-ZZVEND  = 'X'  in Importing Parameters or TEKPO-ZZVEND  = 'X' in Tables  of EXIT_SAPMM06E_017.
After this its entering into
EXIT_SAPMM06E_018.
Finally the data is not getting Saved but the message is showing 'Purchase Order changed'.
Please suggest where I am going wrong.
Regards
K Srinivas

Answer 1

Thankyou for the replies. I kept the following coding in the Exits. The problem is that i kept the break-point in the three exits and after running ME22N,its entering first into Exit 16 and after checking the field(Check Box) in Customer Data Tab ,its entering  into Exit 17. But the zfield in I_EKPO is empty,the value 'X' is not reflecting here. Please suggest where i am doing wrong. I went through many SDN threads and i am unable to solve the issue.
INCLUDE ZXM06TOP.
data: gl_aktyp type c,
      gl_no_screen type c,
      gl_ekpo_ci like ekpo_ci,
      gl_ekpo like ekpo,
      gl_ucomm like sy-ucomm.
data:  gt_ref_ekpo_tab type table of ekpo_tab.
EXIT_SAPMM06E_016
gl_aktyp = i_aktyp.
gl_no_screen = i_no_screen.
ekpo_ci  = i_ci_ekpo.
gl_ekpo = i_ekpo.
EXIT_SAPMM06E_017
move-corresponding i_ekpo to gl_ekpo_ci.
gl_ekpo = i_ekpo.
EXIT_SAPMM06E_018
e_ci_ekpo        = gl_ekpo_ci.
if gl_ekpo_ci-zz_vend ne ekpo_ci-zz_vend.
  e_ci_ekpo-zz_vend = ekpo_ci-zz_vend.
  if gl_aktyp ne 'A'.
    e_ci_update = 'X'.
  endif.
endif.
Regards
K Srinivas