OWB Mapping losing expression contents

I have just recently started having a problem with my OWB 10.2 mappings where I create expressions, enter the expression output information, save, deploy, etc. Mappings work OK but then the next time, or at various times when I go back into the mapping the expression content is gone. I have to re-create the expression output, re-save, re-deploy, etc.
I have recreated the information several times, and it continues to happen. There is no pattern to the loss of expression information, it happens in various mappings, not all, and it doesn't happen every time in the same mappings.
Anyone have any ideas??????
Thanks.

It's a very annoying bug you can't reproduce to report an SR because it doesn't always happen. I think it's most likely to happen when after creating the operator adding attributes first time and saving the mapping, you reopen it and add new attributes. This is something (adding new attributes to operators with more than one group) OWB doesn't manage OK, the references in the altered operator get messed, it's getting even worst with every new version, now we are working with 10.2.0.4, and it's so painful I have determined to redo the operator from new when I have to change it.
Oracle has closed the SR asuring it's working with 10.2.0.5, but I'm sure it reproduces in this version, and the same goes with 11.2, so when we migrate I'll be opening the same SR I've been opening since OWB 9.2.
Regards
ANA GH

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Line 4, Col 6:
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INSERT
INTO
"TB_PIPE_1"
("ASSETNUM",
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"TYPE",
"STATUS",
"YEARLAID",
"MATERIALCODE",
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OWB Mapping losing expression contents

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