I am trying to create an "if" function inside an "if" function, but just the first expression is working. How should I write it?

If(Year<2009;
500;
(If(PrevTSValue(Supply and Resources\River\SF_CatchDM River\Reservoirs\Sobradinho DAM:Storage Volume[m^3]) < 22649; 200; 0))

Thank you!
Érica

There is no problem in WEAP with nested If functions -- I'm not sure why it isn't working for you, although the expression you gave has unbalanced parentheses.

But in this case, you can use the extended form of WEAP's If function: If(TestExpression1, ResultIfTrue1, TestExpression2, ResultIfTrue2, ..., TestExpressionN, ResultIfTrueN, ResultIfAllFalse)

Your expression would be:

If(Year < 2009; 500;
PrevTSValue(Supply and Resources\River\SF_CatchDM River\Reservoirs\Sobradinho DAM:Storage Volume[m^3]) < 22649; 200;
0)

Jack

It worked as you said! So, WEAP assumes that I am inside an if function in every couple of data and I should not include the second "if", right?

Thank you very much!

Érica