Add expression in the load script

[#1]

Hi,

I have this expression in a list box to create an specific tyoe of filter.

=if(empty='false', Aggr(Count({<blocked={0}>}transaction_id), session_id))

Due to this, my qlikview document is too slow, I just want to add this expression somehow to the load script and have it as a field. I can't use aggregatoions there and empty,blocked,session_id belong to one table while transaction_id belongs to another. The tables are linked by the field session_id.

Any help would be appreciated!

thanks