Idoc process code: start an instance of a workflow

[Marten, Michael]

ECC 5.0
Hi,
I just searched the archive but could not find a solution:
 Idoc type ACC_EMPLOYEE_EXP has the following inbound process code:
Process code    Z_EMPLEX_EHF
Description     Inbound Employee expenses via WF - EHF
Identification  WS90000055
                processing with ALE service
                processing by task

So always only one instance of workflow WS90000055  should be created.

Problem: we experience now that 2 instances of workflow WS90000055  were created.
Example: status record for one Idoc:
05.02.2008          13:05:20               62           IDoc passed to application          IDoc inbound procg: Work item 000030511199 started
05.02.2008          13:05:20               62           IDoc passed to application          IDoc inbound procg: Work item 000030508648 started
05.02.2008          12:40:03               64           IDoc ready to be transferred to application        No filters , No conversion , No version change .
05.02.2008          12:40:03               50           IDoc added

Because there are two status=62 records it's obvious that two instances of workflow WS90000055  were created.
But why is the "Idoc passed to application" twice? This should be only once.
Any idea,tip,hint?

Info: WS90000055: no triggering event is defined.
Regrads, Michael from Hamburg/Germany

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