Need to create Dynamic Varient

Hi,
Need to create Dynamic Varient
My Requirement is :
When the program runs on last day of the month, varient has to be set up to populate the
the File path as :
/PA1/Interfaces/FlatFiles/new_sales_history.txt
When the program runs on Working day + 1, then the other varient has to be set up to populate the File Path as :
/PA1/Interfaces/FlatFiles/sales_history.txt
Can anybody let me know how i can create Dynamic Varient...?
Any suggestions will be appreciated!
Regards,
Kittu

Consider the following option:
1) Create two parameters on selection screen. One for working day file and another for working day + 1 file.
2) Use logic inside program to determine if working day or not. Accordingly use the correct file name (from parameter).
3) Users can override the file parameters online. If needed, when the program is run online (SY-BATCH = ' '), issue a confirmation popup for the file to be used.
I am not sure "dynamic variants" is the way to go here because you will have to build another program/process of updating it everyday. But here is information about it anyways...
To create customer defined variables to be used in a variant, you will have to create it in table TVARV. See the following two links for further information:
http://help.sap.com/saphelp_45b/helpdata/en/c0/980398e58611d194cc00a0c94260a5/frameset.htm
https://www.sdn.sap.com/irj/scn/wiki?path=/display/abap/creatingdynamicvariantusingtable+TVARV

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