Updating a table in a single screen without changing the table vie

Hi,
I have a master - detail table base on 2 VOs attached to 2 EO. This 2 Vos are linked via ViewLink by ID;
What I want to achieve is to place a messageTextInput field in detailTable->tableActions region. After the button in this region is pressed this filed should hold summary of "Payments"-columnvalues from detail table ( i have checkboxes in detailed table and it should calculate only selected rows). This field I created is attached to transient attribute SumPayment in MasterVO.
As now, after click of the button the controler call invokeMethod and in AM i do fallowing steps:
1. I get the instance od MasterVO and DetailVO
2. I iterate on every Row in MasterVO and get MasterID
3. Inside i filtered DetailVO where MasterID is the same (MasterVO and DetailVo is linked by MasterID)
4. I filter also at Selected transient attribute is the same as "Y"
5. Sumarize the Payments attribute from DetailVO and save it to float variable calulatedValue
6. For the actual row of MasterTable i do setAttribute("SumPayment",calculatedValue)
Unfortunately after doing this the table in screen navigate to the end of the view (it holds 10 Master -rows at once on the screen). I would like only the summaryField to update and the table looks the same before the click. I don't know also, how to take the MasterID while click of the button and send it as a parameter to CO so i don't have to iterate all MasterVoRows (the button is in inner region).
Konrad

The chances of two applications running at exactly the same time are miniscule. If they each have a connection to the database, and are both trying to modify the same table, then chances are one will be slightly after the other its changes would be committed last. In the case where one might delete a row just before another tries to access that row, you're going to have some sort of problem. However, those circumstances are pretty rare, and even so, some small amount of exception handling can deal with them gracefully.

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