R/3 data flow is timing out in Data Services

I have created an R/3 data flow to pull some AP data in from SAP into Data Services. This data flow outputs to a query object to select columns and then outputs to a table in the repository. However the connection to SAP is not working correctly. When I try to process the data flow it just idles for an hour until the SAP timeout throws an error. Here is the error:
R/3 CallReceive error <Function Z_AW_RFC_ABAP_INSTALL_AND_RUN: connection closed without message (CM_NO_DATA_RECEIVED)
I have tested authorizations by adding SAP_ALL to the service account I'm using and the problem persists.
Also, the transports have all been loaded correctly.
My thought is that it is related to the setting that controls the method of generating and executing the ABAP code for the data flow, but I can't find any good documentation that describes this, and my trial and error method so far has not produced results.
Any help is greatly appreciated.
Thanks,
Matt

You can't find any good documentation??? I am working my butt off just.......just kiddin'
I'd suggest we divide the question into two parts:
My dataflow takes a very long time, how can I prevent the timeout after an hour? Answer:
Edit the datastore, there is a flag called "execute in background" to be enabled. With that the abap is submitted as a background spool job, hence does not have the dialog-mode timeout. Another advantage is, you can watch it running by brwosing the spool jobs from the SAP GUI.
The other question seems to be, why does it take that long even? Answer:
Either the ABAP takes that long because of the data volume.
Or the ABAP is not performing well, e.g. join via ABAP loops with the wrong table as inner.
Another typical reason is to use direct_download as transfer method. This is fine for testing but it takes a very long time to download data via the GUI_DOWNLOAD ABAP function. And the download time would be part of the ABAP execution.
So my first set of questions would be
a) How complex is the dataflow, is it just source - query - data_transfer or are there joins, lookups etc?
b) What is the volume of the table(s)?
c) What is your transfer method?
d) Have you had a look at the generated abap? (in the R/3 dataflow open the menu Validation -> Generate ABAP)
btw, some docs: https://wiki.sdn.sap.com:443/wiki/display/BOBJ/ConnectingtoSAP

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