Forms 6i : Ole Container : Locking problem

We have a form in which user can attach all sorts of documents that are then saved in the database.
Once in a while we have a locking problem; when 2 users try to open the same document, the second one first gets a 'Could not reserve record (2 tries). Keep trying?'. When clicking 'No', the next error message is 'Frm-40501 : unable to reserve record for update or delete', and the form cannot be used anymore. He keeps complaining about the reserved record.
I've been looking into this problem but cannot seem to find a lot of help.
Does anyone have an idea how to solve this locking problem?
I have tried the following things:
* setting the block to locking mode 'Delayed' => we ended up having duplicate records.
* Changing properties of the ole-container (In Place Activation, Inside Out support, ...).
Forms version is 6.0.8.13.0, database 8.0.6.0.0.
Any help is appreciated.

that seems to be a normal locking problem. Do you have tried to work with an ON-LOCK trigger ? (e.g. first to see, when locking will occur, second for implementing an own locking-behaviour, maybe with a SELECT for UPDATE)
Or do you think, that there is something special with your OLE-programming ?
Gerd

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