report - executing dataset and assigning it to variable with beforefactory method birt -


i have dataset returns 1 value. max value query. want assign value report variable before other datasets opened. because have measure in datacube needs variable.

this situation following: have table exchanges come in @ daily basis around 2pm. in form user need select currency wants out of list. want search currency in exchange rate table , give latest currency. (for example, user gave in usd, birt needs check in currency table source currency , usd destination , on). wrote query gives 1 value. can't assign value variable because datasets loaded. value variable remains 0.

can me please!

thanks in advance , greetings belgium


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