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formula: IFF( AND ) doesnt work

formula: IFF( AND ) doesnt work

formula: IFF( AND ) doesnt work

(OP)
Tried this:
For an attribute I created this formula:
IIf([Anfang]>DateSerial(2004;5;10)AND[Anfang]<DateSerial(2004;6;2);"Ja;"Nein")

MS Project complained, this formula is not valid (I am using the German version).

I didnt type in the formula, I only used the buttons to create it. In the Help of MS Project there is no ";" in the IFF() Statement, instead they use only ",".
So I tried the AND with simple [text1] = "name" AND [text2] = "another name" and used only ",". That worked.

Then I tried again the DateSerial(y;m;d). There I had to use the ";" an then MS Project started again complaining.

Please: What's wrong?

Thank's
M. Raab

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