hey Ivan
Ok maybe then I am not able to understand ..
you want the error message to show up but its not showing in the create mode .. the reason could be .. that the mode C is only there the first time the screen loads .. if you change anything in the screen [during the creation process] it will change the IV_mode to U and hence I was asking you not to consider it .as an option ..
For the second issue can you try the below fields at the item level E_ITEM
PRODUCT_SRC_SYS
SRC_OBJECT_TYPE
SRC_GUID >> This one ?
OR
GUID
PARENT >>> THIS ONE ?
Regards
VInita