You can also try to change the Planning Specific Property -> "Real time load behavior " of the cube from Back end BW which will not accept any transaction data until the flag is checked,
This is what Lite optimize do , when it get executed it checks the flag to this so no transaction data is being sent.
If you don't want to send transaction data from input form then the 1st one with "Planning not allowed" should be checked.
Hope this helps.