No data delivered via RFC

Hello,
I´d like to know if there are is anything particular I have to keep in mind when creating a function module which is to be called by a Web Dynpro?
I´ve experienced the problem of having no result in my Web Dynpro table, although everything should be configured correctly.
Now I found out that the import parameters are delivered to the system and the sql-query is performed (ST05).
But since I used a network packet sniffer, I couldn´t detect any data delivered back to the J2EE engine.
Do you know, what could go wrong? Do I have to configure the target system in a special way?
Some facts:
- an export parameter is delivered,
table isn´t
- function module test is okay
- traffic light is yellow during import of the model, when choosing this function. (in NW developer Studio)
I´d appreciate any hint.
Kind regards
Robin

Now I get the data out of the R/3-System (checked with network sniffer), but it isn´t shown on the Web Dynpro.
Code and Contexts seem to be okay.
I´m also invalidating the context.
I´ve changed the tables parameter into export parameter, but it doesn´t have any effect on the problem.
Some tips for me?
kind regards
robin

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let us say outbound is SAPLID server
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            Password : RGSHYD
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     Par.Type   : LS
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DATA: ITAB TYPE TABLE OF BDCMSGCOLL.
DATA: PROGRAM LIKE SY-REPID,
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CLEAR WA_BDCDATA.
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(ALE)":
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Authorization Description
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For example, for a non-SAP system to send IDocs to a SAP System using transactional RFC, it must also send a SAP user ID and password.
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hey,
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Hi again.
To shorten development time we considered the following solution:
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Message was edited by: Sascha Dingeldey
Message was edited by: Sascha Dingeldey

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JCO.ServerThread-1 [13:15:27:437]: [JNI-LAYER] RFC.incomingRequestHandler() before dispatchRequest("IDOC_INBOUND_ASYNCHRONOUS")
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JCO.ServerThread-1 [13:15:27:515]: [JAV-LAYER] JCO.PoolManager.releaseClient: Cannot release client equals null
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JCO.ServerThread-1 [13:15:27:515]: [JNI-LAYER] RFC.abort() enter, [SUCCESS]
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No data delivered via RFC

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