Mapping errors between data object and automated activity

Hi,
in a automated activity of a bpm process I try to call a web service method ("addBook") which exptects an object called u201CbookWrapperu201D. The object "bookWrapper" consist of three variables: u201Cbidu201D (Integer), u201Cauthoru201D (String), u201Ctitleu201D (String).
When I try to directly map, for example u201Ctitleu201D, out of an existing Data Object (Filled by an human activity: u201CDO_CreateBooku201D) I got the error:
Expected: xsd:string
Found list of u2018com.sap.dictionary.stringu2019
Severity and Description Path Resource Location Creation Time Id
The literal: "Expression for target path 'DO_BookWrapper/title' has errors." do not have type, in expression: "#erroneous=true;sources=TaskOutput/UIResponse/start/title#TaskOutput/UIResponse/start/title". LocalDevelopmentLocalDevelopmentbook_chapter_process~demo.sap.com/src/bpmn create book and chapter.bpmn Expression for target path 'DO_BookWrapper/title' has errors. [Galaxy, Rule, Literal] 1260878200220 4720
I do not know why this error occurs because both type are strings. Is it due to the fact that I do not have an object instead of variables as input parameters? I used the automatically generated data types as data objects.
May anybody help me please? Can I make casts?
Regards

Hi Martin,
From the error that you get, it is indicated that you try to map a list to a single variable.
If you want to do so, please see the documentation http://help.sap.com/saphelp_nwce711/helpdata/en/47/63604e42bf6831e10000000a421937/frameset.htm where it is said:
If you map a node, whose content is a list or a node, with one or more parents that are lists, to a single-valued node, you get an error. Depending on your needs you could provide custom expression, for example to aggregate the list to a single value, or you could do parent mapping between the multi-valued parent nodes.
So you need to create an EJB function that does the conversion between a list and single value type. Here is the help for functions: http://help.sap.com/saphelp_nwce711/helpdata/en/47/63604e42bf6831e10000000a421937/frameset.htm and especially for EJB functions http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/609c9982-39af-2b10-768b-e5bd8813c1f3.
I hope this helps you.
Best regards,
Radost

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Hi
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Message was edited by: Bhima Chandra Sekhar Guntla

Hi,
How to know which master data objects need to activated from delivery version to active version in R/3 for a particular standard cube like 0SD_C03.
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Message was edited by:
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kanan thiyam
Posts: 28
Questions: 7
Registered: 1/8/07
Forum points: 24
   Re: What is deffernce b/w Data type and message type
Posted: Jun 13, 2007 8:05 AM    in response to: suresh k         Reply      E-mail this post
Hi Suresh,
Data Type defines the structure of the message and it will be wrapped under Message Type.
Hope the details below will clearify your doubts.
A data type in a programming language is a set of data with values having predefined characteristics. Examples of data types are: integer, floating point unit number, character, string, and pointer.
The characteristic of columns and variables that defines what types of data values they can store.
Check out the details:
http://en.wikipedia.org/wiki/Data_type
A message type comprises a data type that describes the structure of a message. At the following points in SAP Exchange Infrastructure you can refer to the message to be exchanged at runtime by using the message type:
Details:
http://help.sap.com/saphelp_nw04/helpdata/en/2d/c0633c3a892251e10000000a114084/content.htm
kanan

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