>Hi everybody,
>
>Quite recently I changed one of UDF, which is used in several our applications. I added couple new parameters, made it more robust, etc. However, sometimes I get a message: "Need to specify additional parameter" and when I try to debug, I see "Source not available" Error. Does it mean, I have to recompile all applications? Some of them are not mine...
>
>Thanks in advance.

That error (#94, "Must specify additional parameters") means that the calling statement is passing more parameters than the UDF has specified. In the situation you describe, this would happen if a call using the new, additional parameters is being made to an application that still has the old version of the UDF. So the answer is yes, you should recompile all applications that have that UDF in them.