Complex interface determination fails for 0-N mappings

We have a mapping question for the following scenario in PI 7.1: One message needs to be mapped into two target structures, it comes from the same sender and goes to same receiver. We need to call two different BAPI in the same SAP end system simultaneously.
This is set up in one interface determination (same sender & receiver) where we use two different operation mappings with different receiver interface names. If the mapping have multiplicity 1, everything works fine and the message gets mapped to both receiver interfaces simultaneously. But, when the multiplicity of the mappings is 0-N (split mapping), then we get error message during interface determination phase:
Error when determining the inbound interface: Inbound interface found several times (for same sender and receiver) for the outbound interface http://sending/namespace.sndInterfaceName
How can we set up our scenario with two 0-N mappings without getting error message? One option would be combining two mappings in one, but this can not work in our case because of the high complexity.
Any comments appreciated. Thanks, Sanjay.
Edited by: Sanjay Gupta on Oct 21, 2010 10:50 PM

Thanks for taking the time to look into this. See my comments below.
1. Are you using multi mapping? Source Message type 1 and Traget message types 2 (added from messages tab in the mapping)
We have two mappings, both create only a single output type, however, they are split mappings, meaning the mapping result message multiplicity is 0-N. So the answer is NO, this are no multi mappings
2. At any time, can both the target messages be created or are they mutually exclusive?
both targets will always be created, they are NOT mutually exclusive
3. With in each message type that gets generated on the target side, is the occurance 1..1 or 1..unbounded?
Don't fully get the question, but I assume you ask if the mapping is defined as a 1:1 or 1..N mapping. The latter is true.
4. Is there any condition in the interface determination?
Answer is No.
5. How many operation mappings did you design.
We have two operation mappings, each containing a different mapping to the different receiver interface type.
Being said that, the ideal way should be, You need to create only one message mapping by adding multiple message types on the target side. I fully understand and agree with this statement, but due to the complexity of the mapping we need to separate it out into two mappings.
It is confusing, that the described scenario works if the multiplicity of the mapping objects used is 1, but as soon as the multiplicity is 0-N (when using a split mapping instead), we start getting the error message.

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