[RBS] Question about unemployment benefits

[The Jerenbergs]

I am currently receiving unemployment benefits from Bituach Leumi and I have 
the possibility of getting a one-off project which will take me a couple of 
weeks at most to do. Can anyone advise me what the consequences could be 
when I tell B.L. that I found a very temporary job? Or could anyone tell me 
who WOULD know the B.L. rules?
TIA
Batya Jerenberg