Number of Item segments determine number of occurences in 1:N multi mapping

I'm trying to split MATMAS05 to multiple occurences of MATMAS05 1:N. The target MATMAS05 I have duplicated it a few times depending on the number of plants.
If E1MARCM-WERKS = 1234 then assign MATMAS05 -> MATMAS05
/ns0:Messages/ns0:Message1/MATMAS05=ifWithoutElse([keepss=false]stringEquals(removeContexts(/ns0:Messages/ns0:Message1/MATMAS05/IDOC/E1MARAM/E1MARCM/WERKS=), const([value=1234])), /ns0:Messages/ns0:Message1/MATMAS05=)
The above logic gives me the error:
11:51:28 Start of test
Compilation of MM_Split_MATMAS05 successful Cannot produce target element /ns0:Messages/ns0:Message1/MATMAS05[2]/IDOC. Check xml instance is valid for source xsd and target-field mapping fulfills requirements of target xsd Cannot produce target element /ns0:Messages/ns0:Message1/MATMAS05[2]/IDOC. Check xml instance is valid for source xsd and target-field mapping fulfills requirements of target xsd
11:51:44 End of test
Could someone kindly advice what is the mistake here?

Hi Abhishek,
The target message in the MM under the tab Messages I have changed the occurence from 1 to 0..unbounded and after that I right clicked and duplicated the subtree for MATMAS05. So now in the MM window it shows as below:
Messages            1:1
Message1          1:1
       MATMAS05      0..unbounded
       MATMAS05      0..unbounded
       MATMAS05      0..unbounded
and my mapping condition is as follows:
/ns0:Messages/ns0:Message1/MATMAS05=ifWithoutElse([keepss=false]stringEquals(removeContexts(/ns0:Messages/ns0:Message1/MATMAS05/IDOC/E1MARAM/E1MARCM/WERKS=), const([value=4510])), /ns0:Messages/ns0:Message1/MATMAS05=)
Regards,
// Saj

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