Unable to pass parameters to Web Service

[Andrea V.F.]

I've made an Infopath form where I call a Web service for reading some
data. lets call it "readData". This web service returns the data in a
complex Type, for example:

returnType:
Val1:string
Val2:string

This Works well. But I have also a call to a webservice for posting
data (lets call it "sendData") with a complex type agument, for
example:

parameterType:
val3:int
val4:string

When I make the connection fot "sendData" in Infopath it does not
create automatically the Fields in "Data Surce". I create it manually
(Same name and type of the "parameterType"), but when i send the form
into web service val3 and val4 are "nothing" and they does not receive
the data i've filled in the module.

Why this happens???

Thanks