Interface Mappings in BPM Collect Pattern

Question

Hello
I am new to XI development and currently facing problems while implementing collect pattern of BPM.
I am trying to map IDoc structure with target legacy format.In BPM I had a block with infinite loop where I am transforming IDocs to target legacy format.Then I am trying to transform list element (Multiline Abstract container variable) to form a single message.For this I tried to have interface map with Occurences 0..unbound..but while activation of Interface Map it gives error
<b> Mapping program Message does not match the interface mapping. The number or frequencies of source or target messages for the message mapping are not identical to the number or frequencies of source or target interfaces.</b>
If I use single line in Interface map then in BPM it gives error when passed Multiline element to this Interface map.
I checked the sample program provided by SAP but I found out that every message interface was using same Message Type which has got occurence as 1 but in the message mapping program its 0..unbound.
My question is can we have data type (or Message type )with Occurence as 1 and Message Mapping program using same message type with occurences 0..unbound..I tried to find such option but could'nt find that.Otherwise how to do Interface Map for transforming Multiline parameter of BPM to a single message.
Please help..Thanks in advance..
Regards
Rajeev Patkie

Answer 1

Initially I tried to perform test by tree view and it worked fine.But it was one message in the source and the same was in target.Later as given by you I updated XML source message.The source message looks like
******************Source Message***********************
<ns0:Messages xmlns:ns0="http://sap.com/xi/XI/SplitAndMerge">
  <ns0:Message1>
    <ns1:MATMAS_to_Stockware_MT xmlns:ns1="http://mccormick.com/ez_dev">
      <MAT_List>
        <ZPITNO>121212</ZPITNO>
        <ZPIDS>Test Message</ZPIDS>
        <ZPPOPN />
        <ZPCNQT />
        <ZPZLOC />
        <ZPZPCB />
        <ZPZCPA />
        <ZPGRWE />
        <ZPSAEL />
        <ZSPLDY />
        <ZPFRAG />
        <ZPZCRO />
        <ZPZOPT />
      </MAT_List>
    </ns1:MATMAS_to_Stockware_MT>
  </ns0:Message1>
</ns0:Messages>
<ns0:Messages xmlns:ns0="http://sap.com/xi/XI/SplitAndMerge">
  <ns0:Message2>
    <ns1:MATMAS_to_Stockware_MT xmlns:ns1="http://mccormick.com/ez_dev">
      <MAT_List>
        <ZPITNO>78912</ZPITNO>
        <ZPIDS>Test Message12</ZPIDS>
        <ZPPOPN />
        <ZPCNQT />
        <ZPZLOC />
        <ZPZPCB />
        <ZPZCPA />
        <ZPGRWE />
        <ZPSAEL />
        <ZSPLDY />
        <ZPFRAG />
        <ZPZCRO />
        <ZPZOPT />
      </MAT_List>
    </ns1:MATMAS_to_Stockware_MT>
  </ns0:Message2>
</ns0:Messages>
************************End Source*********************
if this would be the message multiline is generating its bound to fail as I guess every XML has one topmost element and over here.So I changed my source XML to look like
******************Start message******************
<ns0:Messages xmlns:ns0="http://sap.com/xi/XI/SplitAndMerge">
  <ns0:Message1>
    <ns1:MATMAS_to_Stockware_MT xmlns:ns1="http://mccormick.com/ez_dev">
      <MAT_List>
        <ZPITNO>121212</ZPITNO>
        <ZPIDS>Test Message</ZPIDS>
        <ZPPOPN />
        <ZPCNQT />
        <ZPZLOC />
        <ZPZPCB />
        <ZPZCPA />
        <ZPGRWE />
        <ZPSAEL />
        <ZSPLDY />
        <ZPFRAG />
        <ZPZCRO />
        <ZPZOPT />
      </MAT_List>
    </ns1:MATMAS_to_Stockware_MT>
  </ns0:Message1>
  <ns0:Message2>
    <ns1:MATMAS_to_Stockware_MT xmlns:ns1="http://mccormick.com/ez_dev">
      <MAT_List>
        <ZPITNO>78912</ZPITNO>
        <ZPIDS>Test Message12</ZPIDS>
        <ZPPOPN />
        <ZPCNQT />
        <ZPZLOC />
        <ZPZPCB />
        <ZPZCPA />
        <ZPGRWE />
        <ZPSAEL />
        <ZSPLDY />
        <ZPFRAG />
        <ZPZCRO />
        <ZPZOPT />
      </MAT_List>
    </ns1:MATMAS_to_Stockware_MT>
  </ns0:Message2>
</ns0:Messages>
**********************End Message****************
but this produces only one output message
******************Start Message***********************
<?xml version="1.0" encoding="UTF-8"?>
<ns0:Messages xmlns:ns0="http://sap.com/xi/XI/SplitAndMerge">
  <ns0:Message1>
    <ns1:MATMAS_to_Stockware_List xmlns:ns1="http://mccormick.com/ez_dev">
      <MAT_List>
        <ZPITNO>121212</ZPITNO>
        <ZPIDS>Test Message</ZPIDS>
        <ZPPOPN />
        <ZPCNQT />
        <ZPZLOC />
        <ZPZPCB />
        <ZPZCPA />
        <ZPGRWE />
        <ZPSAEL />
        <ZSPLDY />
        <ZPFRAG />
        <ZPZCRO />
        <ZPZOPT />
      </MAT_List>
    </ns1:MATMAS_to_Stockware_List>
  </ns0:Message1>
</ns0:Messages>
**********************End Message****************
I am also pasting schema of message mappings
*****************Source Schema************************
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema targetNamespace="http://sap.com/xi/XI/SplitAndMerge" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://sap.com/xi/XI/SplitAndMerge">
  <xsd:import namespace="http://mccormick.com/ez_dev" />
  <xsd:element name="Messages" xmlns:p0="http://mccormick.com/ez_dev">
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element name="Message1" form="qualified">
          <xsd:complexType>
            <xsd:sequence>
              <xsd:element ref="p0:MATMAS_to_Stockware_MT" minOccurs="0" maxOccurs="unbounded" xmlns:xsd="http://www.w3.org/2001/XMLSchema" />
            </xsd:sequence>
          </xsd:complexType>
        </xsd:element>
      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>
</xsd:schema>
********************End Source***********************
********************Target Schema******************
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema targetNamespace="http://sap.com/xi/XI/SplitAndMerge" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://sap.com/xi/XI/SplitAndMerge">
  <xsd:import namespace="http://mccormick.com/ez_dev" />
  <xsd:element name="Messages" xmlns:p0="http://mccormick.com/ez_dev">
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element name="Message1" form="qualified">
          <xsd:complexType>
            <xsd:sequence>
              <xsd:element ref="p0:MATMAS_to_Stockware_List" />
            </xsd:sequence>
          </xsd:complexType>
        </xsd:element>
      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>
</xsd:schema>
****************************End Target*************
Thanks in advance.
Regards
Rajeev