Entering values in Web Services ID and Description, for External Catalog

Hi,
I am trying to connect to an external Vendor Catalog from ERP. Pl note that we just have ERP ECC 6.0 and no SRM. I went to SPRO and followed menu path 'Materials Management >> Purchasing >> Web Services: ID and Description'. I am not sure what to enter in 1) Seq. Number 2) Name of Parameter for Web Service and 3) Call Structure COLUMNS.
I have URL from Vendor, User Name and Password. I need to know what values are mandatory here so I can successfully connect to external Catalog. If someone can give me sample values, I can try.
Any help is appreciated,
Niranjan

Update on 08/23/2011.
We are able to connect to Vendor Catalog, select items in Cart. When I press 'Place Order' button, I see all items populated in SAP PO ME21N screen. We can then add other information and create PO. This is working great. We have another question. Heard that with ERP ECC 6.0, we can only connect 1 vendor catalog. But with SRM, we can connect more than 1 vendor catalog. Is there a BAPI or change SAP code to connect more than 1 vendor catalog from ECC 6.0 ?

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Hi Kent,
A few answers inline...
HTH,
Bruce
Kent Kvarfordt wrote:
>
Hi List,
I have several questions reqarding web services, schemas, and the use of the xsi:type
attribute in messages.
Schemas:
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representations, see this section [a] in the docs on roundtripping
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[a]
http://edocs.bea.com/wls/docs81/webserv/assemble.html#1074725
Q2: Is it reasonable for a schema to contain derived types by extension [1]?
Q3: Could you use the International Purchase Order Schema [2] with a web service?
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Q1: Is it reasonable for a web service to use the xsi:type attribute in the message(s)?
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http://www.ws-i.org/Profiles/Basic/2003-08/BasicProfile-1.0a.html#refinement34259632
>
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>
And finally,
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in messages?Sorry, I looked and could not find any examples.
>
Whew !!!
TIA,
Kent
[1] http://www.w3.org/TR/xmlschema-0/#DerivExt
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Entering values in Web Services ID and Description, for External Catalog

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