Receiver determination for Split Message - Bulk message handling

Question

All,
I have a scenario where MATMAS message is split to multiple receivers via multi mapping 1:n; the split is based on plant specific data, all works fine the mapping splits the message perfectly.
The problem I have is in configuring the receiver determiniation. I have put conditions based on plant specific data the message should be distributed to the appropriate receiver. At runtime the MATMAS message received is treated as a bulk message and it produces mutiple sub-documents however in my case if the MATMAS has 3 plant specific data the data is send to all the 3 receivers instead of sending just one message per plant to the appropriate receiver.
Its IDOC to File scenario on XI 3.0, SP20.
Receiver Determination:
/MATMAS05/IDOC/E1MARAM/E1MARCM/WERKS = 'xxxx' -> send to XXXX_receiver
/MATMAS05/IDOC/E1MARAM/E1MARCM/WERKS = 'yyyy' -> send to YYYY_receiver
Though the receiver determiniation splits the message by plant it could be that a material is maintained for both xxxx and yyyy plants and in this case both should receive the message but the contents would be different. The problem I have is both messages are delivered to both receivers.
I appreciate those who have taken the time to read the thread and thank you all in advance supporting with advices.
/ Saj

Answer 1

Please find attached the source xml before transormation used for the xpath that I have indicated in my original message. From the below message E1MARCM-BESKZ differs on each plant and also has a corresponding warehouse view E1MLGNM where for example LHMG1 value differs for each warehouse.
  <?xml version="1.0" encoding="UTF-8" ?>
- <MATMAS05>
- <IDOC BEGIN="1">
- <E1MARAM SEGMENT="1">
  <MSGFN>005</MSGFN>
  <MATNR>000000000001002201</MATNR>
  <MTART>ZFGS</MTART>
  <MATKL>1111003</MATKL>
- <E1MAKTM SEGMENT="1">
  <MSGFN>005</MSGFN>
  <SPRAS>E</SPRAS>
  <MAKTX>AA Ni-MH Rechargeable Batteries</MAKTX>
  </E1MAKTM>
- <E1MARCM SEGMENT="1">
  <WERKS>4911</WERKS>
  <BESKZ>F</BESKZ>
  </E1MARCM>
- <E1MARCM SEGMENT="1">
  <WERKS>4912</WERKS>
  <BESKZ>X</BESKZ>
  </E1MARCM>
- <E1MARCM SEGMENT="1">
  <WERKS>5020</WERKS>
  <BESKZ>E</BESKZ>
  </E1MARCM>
- <E1MARMM SEGMENT="1">
  <MEINH>CS</MEINH>
  </E1MARMM>
- <E1MLGNM SEGMENT="1">
  <LGNUM>020</LGNUM>
  <LHMG1>2020.000</LHMG1>
  <LETY1>E2</LETY1>
  </E1MLGNM>
- <E1MLGNM SEGMENT="1">
  <LGNUM>023</LGNUM>
  <LHMG1>2323.000</LHMG1>
  <LETY1>E2</LETY1>
  </E1MLGNM>
- <E1MLGNM SEGMENT="1">
  <LGNUM>024</LGNUM>
  <LHMG1>2424.000</LHMG1>
  <LETY1>E2</LETY1>
  </E1MLGNM>
- <E1MVKEM SEGMENT="1">
  <VKORG>4900</VKORG>
  <PRAT1>X</PRAT1>
  </E1MVKEM>
- <E1MVKEM SEGMENT="1">
  <VKORG>5000</VKORG>
  <PRAT1>/</PRAT1>
  </E1MVKEM>
  </E1MARAM>
  </IDOC>
  </MATMAS05>
so in this example above:
Receiver 4911 (WERKS) should receive:
F + 2020 (BESKZ + LHMG1)
Receiver 4912 (WERKS) should receive:
F + 2323 (BESKZ + LHMG1)
Receiver 5020 (WERKS) should receive:
F + 2424 (BESKZ + LHMG1)
The problem is all these 3 messages are delivered to all the 3 plants thus making it 9 messages delivered in total as against 3.
/ Saj