Attachment via B1if " Source file does not exist "

Hi Friends,

Im trying to insert a jpg file into the ATC1 table via B1if scenario and used the B1 object atom with object id = 221

but when i try to insert a source file with path i get an error like this:

com.sap.b1i.xcellerator.XcelleratorException: XCE001 Nested exception:
com.sap.b1i.xcellerator.XcelleratorException: XCE001 Nested exception:
java.lang.RuntimeException: DI Error: (-5002) Source file does not exist  , 'D:\pk\blue.jpg'-The di call #1 did fail.

I checked the path many times the source path is correct .still it shows that source file does not exist.

i tried changing the path to C: drive as well still the same error.

my target path is a B1share folder "\\testsrv\B1_SHR\Attachment".

what am i missing guys pls help! i need to insert and update the ATC1 table via B1if for attachment entry through Webservice.

Thanks in advance.