Reducing number of rows displayed causes error in Forms 6

I created a search page - really just a tabular form displaying 29 records and a scroll bar at the end. Each record has a button adjacent to it. The idea being that the user can search for a specific map in a field and have all records where that map is referenced displayed. When the user clicks the button a trigger takes it to a detail screen where the entire record (and 7 more screens) is displayed. Everything works fine.
Problem is I want to reduce the number of records displayed to 15, so I select the appropriate block in the object navigator, then change Number of Records Displayed from 29 to 15 and press enter - the number changes in the property palette - but nothing changes in the form.
When I compile the form I get the following error
FRM-30356: Too many records displayed for this item.
Item: MDD_NO
Block: SEARCH
Form: MODULE1
FRM-30085: Unable to adjust form for output.
If I change the rows displayed back to 29, everything works fine again.
Any idea of what I am doing wrong?
All help appreciated
Glenn

Thank you - solved the problem
The number of items displayed property was set to 29 for each column on that page. As I usually only set the Items Displayed at the Data Block Level - I was suprised to see it set at the Item level.
Since this was the only page where it was set at the Item level - all my other multiple row pages are set at the Block level - Any idea what I may have done to cause this?
Thanks Again
glenn

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