Receipt Web Service

Hi all

I try to import Receipt from XML files through Receipt Web Service,
everything works for header and details but when i try to put
serialnumbers on it a got a message Serial Doesn't match (0) Selected,
X (Required) , does anyone already did it.
I use GetSerialFormat and AddSerialNum from SelectedSerialNumber Service
and add SelectedSerialNumber in the dataset but i always got this
message :(.

Any Ideas ?

Thanks in advance.
Fred.