SD - Billing - External Number Range

Question

Hi,
I have two questions related to SD billing document numbering:-
1. I am getting error message of [Please specify an internal number range Message no. NR752] while saving a billing document based on the delivery. I have checked only external number range box in VN01. Do I need to use any user-exit for this? If yes then there are 2 user exits available -
a) USEREXIT_NUMBER_RANGE_INV_DATE USING US_RANGE_INTERN in program RV60AFZC
                          b) FORM USEREXIT_NUMBER_RANGE USING US_RANGE_INTERN in program RV60AFZZ
but both the cases the variable is US_RANGE_INTERN which is not allowing external number range ID to pass. How this external no range works.?
2. I have a business requirement for our Mexican company code on external alphanumeric number. There would be 3 billing types say, ZF2, YF2 and ZYF2. Mexican government provides Invoice numbers in advance.
ZF2 Number range would be A001 to A999
YF2 Number range would be B001 to B999
ZYF2 Number range would be C001 to C999.
All these Invoices would be created at same time. i.e. parallel processing. Also all these invoices would be transmitted thru EDI -IDOC. And accounting document should have same number as billing document will carry i.e. external govt provided numbers.
How do I map this in systems. My experience says alphanumeric number range is not supported by SAP. Anybody may share his solution on this would be simply great.
Thanks
Subrata Das

Answer 1

FORM USEREXIT_NUMBER_RANGE                                    *
      This userexit can be used to determine the numberranges for   *
      the internal document number.                                 *
      US_RANGE_INTERN - internal number range                       *
      This form is called from form LV60AU02                        *
FORM USEREXIT_NUMBER_RANGE USING US_RANGE_INTERN.
Example: Number range from TVFK like in standard
US_RANGE_INTERN = TVFK-NUMKI.
*{   INSERT         DEVK905392                                        1
There was a need to check whether all the mandatory pricing
conditions have been filled before creation of an invoice so that
the invoice is released to accounting as and when it is created.
Piece of code written below ensures the same. Field uvprs = 'X'
in item table indicates that the item is incomplete with respect to
pricing.
  LOOP AT xvbrp WHERE uvprs = 'X'.
    EXIT.
  ENDLOOP.
  IF sy-subrc EQ 0.
    MESSAGE e073(vf) WITH xvbrp-posnr.
  ENDIF.
TABLES : zbd_nr_code.
data : aa like zbd_nr_code-nr_code.
  IF sy-tcode = 'VF01'.
   SELECT SINGLE *
     FROM tvko
    WHERE vkorg = vbak-vkorg.
   IF sy-subrc EQ 0.
      SELECT SINGLE NR_CODE INTO ZBD_NR_CODE-NR_CODE
        FROM zbd_nr_code
       WHERE vkorg    = vbrk-vkorg
         AND werks    = vbrp-werks
         AND fkart    = vbrk-fkart.
      IF sy-subrc = 0 .
        us_range_intern = zbd_nr_code-nr_code.
      ENDIF.
   ENDIF.
  ENDIF.
I feel this will help out.
Regards