Python sapnwrfc FUNCTION CALL ERROR

Question

Hi everyone,
I am trying an external rfc connection with sapnwrfc-0.05 for Python. I have the latest nwrfcsdk from SAP. It took me a while to figure out the new python module methods, but I am now able to connect successfuly.
I have a function module that I need to call and feed external data to it. This function is writing to a Z table of mine. I have done this successfuly with previous versions of python sapnwrfc module.
Here is my test code:
import sapnwrfc
conn = sapnwrfc.base.rfc_connect({'ashost':'HOSTNAME', 'sysnr':'00', 'client':'900', 'user':'RFCUSER', 'passwd':'PASSWORD' })
if conn :
    print "I am connected"
#    VBELN = CHAR
#    LNUMB = NUMC
#    WERKS = CHAR
#    GJAHR = NUMC
#    HEAT =  NUMC
#    ZIERA = CHAR
#    ZLENG = CHAR
#    ZWEIG = CHAR
#    ZINDX = CHAR
#    ZPDA = CHAR
#    ZTIME = CHAR
    data = [VBELN+LNUMB+WERKS+GJAHR+HEAT+ZIERA+ZLENG+ZWEIG+ZINDX+ZPDA+ZTIME]
    iface = conn.discover("MY_Z_FUNCTION_MODULE")  
    f = iface.create_function_call()
# MY_Z_FUNCTION_MODULE has a TABLE structure DATA
    f.DATA(data)
    f.invoke()
    print "Done"
    conn.close()
When I run this code I get the following ERROR:
File "/usr/lib/python2.4/site-packages/sapnwrfc/__init__.py", line 165, in invoke
    return self.handle.invoke()
sapnwrfc.RFCCommunicationError: RFC FUNCTION CALL ERROR: set_table_line invalid Input value type
The same function module was working before, when called with DATA as a single string item in a list.
Any help?
Thank you all.
Menelaos

Answer 1

As I discovered, you need to supply the DATA table structure with a dictionary of its field values:
data = [{'VBELN':VBELN,
            'LNUMB':LNUMB,
            'WERKS':WERKS,
            'GJAHR':GJAHR,
            'HEAT':HEAT,
            'ZIERA':ZIERA,
            'ZLENG':ZLENG,
            'ZWEIG':ZWEIG,
            'ZINDX':ZINDX,
            'ZPDA':ZPDA,
            'ZTIME':ZTIME}]
Just make sure that each field has the correct size. The data types in the dictionary should all be strings, but the string contents should match the field types of the DATA table structure....
This is really an improvement over the old method (single string) but some documentation would be helpfull Piers!
Can I help?
Menelaos Maglis
Edited by: Menelaos Maglis on Jul 25, 2008 10:49 AM
A correction on the data field types.