Using Dynamic Function module

Question

Hi,
I have requirement where  have to call FM dynamically. I need to check if the IS OIL switch is on, than call the OIL FM otherwise normal FM.
Problem is when the IS OIL switch is off, the Oil FM will not be present and will give syntax error. Hence the requirement to use dynamic FM calling
I went through some site & found how to use this FM. But in those FM you have declare data type of Input/export parameter.
Since in absence of Oil switch this data corresponding data element & domain would also be not there, I need to used this data declaration also dynamically.
Is there a way i can code for the above requirement to use Data declaration & FM dynamically, without giving syntax error.
Thanks,
Harish

Answer 1

Hi,
Thanks for the reply. In this case let's say i will code like this.
If FM exists call FM else not.
For the calling FM dynamically i have to pass the parameter
let's say i write like something here
Data : I_CHARG like OIB_DEF_INDEX_GM-CHARG. u201C First export paramter
DATA:        ptab TYPE abap_func_parmbind_tab,
          ptab_line TYPE abap_func_parmbind,
                      func TYPE string.
Func =  u2018OIB_QCI_READ_CONV_PARAMETERSu2019    " FM name
Exporting value 1
         I_CHARG  = 'XYZ'
Add into dynamic table
ptab_line-name = 'I_CHARG '.
ptab_line-kind = abap_func_exporting.
GET REFERENCE OF  I_CHARG   INTO ptab_line-value.
INSERT ptab_line INTO TABLE ptab
Here the issue is since the oil switch id off, data type  OIB_DEF_INDEX_GM-CHARG, will not be there
Once this program is loaded it will not compile
I need to declare this data I_CHARG also dynamically. Thihs is due to the fact that  program with data declaration is loaded first & any program logic ( if else ) is done afterwards.
Once the program is loaded, sicne the data element is not there, it will not comiple & give error
I hope I am clear with the question
Regards
Edited by: Harish Wadhwani on Oct 21, 2010 9:35 PM