IP - Problem in FOX formula: how to use 0FISCPER3 counter of a DO function?

Question

Hi,
IP 7.0:
I'd like to define a top-down function which distributes the values in 0FISCPER3 = # to the periods selected by the user with two variables (period from and period to variable).
-> Problem I experience is the conflict in different data types. How can I use the value of the selection variable for 0FISCPER3 in a counter of a DO function. Here is the code:
formula example:
change the value of the keyfigure ZQUANTITY of PRODUCT11
to the value of ZQUANTITY of PRODUCT09 times 1.1
assumption for fields to be changed: ZPRODUCT
                 ==> operand: {name of keyfigure, ZPRODUCT}
  DATA L_FACTOR TYPE F.
  L_FACTOR = 1.1.
  { ZQUANTITY, PRODUCT11 } = { ZQUANTITY, PRODUCT09 } * L_FACTOR.
DATA LV_COUNTER TYPE 0FISCPER3.
DATA LV_PERIODS TYPE  0FISCPER3.
DATA LV_PERIOD_FROM TYPE 0FISCPER3.
DATA LV_PERIOD_TO TYPE 0FISCPER3.
*Transfer variable period from and period to into local variable and count interval of periods.
LV_PERIOD_FROM = VARV(Z_PERIOD_FR).
LV_PERIOD_TO = VARV(Z_PERIOD_TO).
LV_PERIODS =  LV_PERIOD_TO - LV_PERIOD_FROM.
Do top-down distribution for all adjustment values on period = #
LV_COUNTER = (LV_PERIOD_FROM).
DO.
<b> { 0G_QVVGRM, LV_COUNTER} = { 0G_QVVGRM, # } / LV_PERIODS.</b>
<b> LV_COUNTER =  LV_COUNTER + 1.</b>
    IF LV_COUNTER >= LV_PERIOD_TO.
        EXIT.
  ENDIF.
ENDDO.
-> the lines indicated in bold give errors. If I change the datatype of LV_COUNTER to I, how to start the do function the value of the first period selected by the user?
function TMLV is also not supported apperantly in IP.
Help would be very appreciated
regards
D

Answer 1

Small extension:
function TMVL does work, but I still have the problem to use the difference in periods solely for calculation in a key figure. I cannot switch from type 0FISCPER into F or I. In SAP R/3 ABAP this is no problem but apperantly in FOX it is???
Hereby revised coding:
DATA LV_COUNTER TYPE I.
DATA LV_PERIODS TYPE  0FISCPER3.
DATA LV_PERIOD_FROM TYPE 0FISCPER3.
DATA LV_PERIOD_TO TYPE 0FISCPER3.
DATA LV_FISCPER3 TYPE 0FISCPER3.
*TRANSFER VARIABLE PERIOD FROM AND PERIOD TO INTO LOCAL VARIABLE AND COUNT INTERVAL OF PERIODS.
LV_PERIOD_FROM = VARV(Z_PERIOD_FR).
LV_PERIOD_TO = VARV(Z_PERIOD_TO).
LV_PERIODS =  LV_PERIOD_TO - LV_PERIOD_FROM.
DO TOP-DOWN DISTRIBUTION FOR ALL ADJUSTMENT VALUES ON PERIOD = #
LV_COUNTER = 0.
DO.
  LV_FISCPER3 = TMVL(LV_PERIOD_FROM,LV_COUNTER).
<b>{ 0G_QVVGRM, LV_FISCPER3} = { 0G_QVVGRM,#} / LV_PERIODS.</b>
{ 0G_QVVGRM,#} = { 0G_QVVGRM,#} - { 0G_QVVGRM, LV_FISCPER3}.
IF { 0G_QVVGRM, #} < 0.01.
EXIT.
ENDIF.
LV_COUNTER = LV_COUNTER + 1.
ENDDO.
ERROR: conflict between operation type F and 0FISCPER3