Master-Detail relationship and querying back from the detail block

Hello friends,
Using oracle forms 6i. I have a multi data block. On the block there is a header and detail section. There is master detail relationship present in these blocks. I have a sequence defined, which generates an auto-number.
Now in the detail section say I have 4 records all of which are say invoices and I am populating the details about it. On the 'save' button I have defined a logic which generates an auto- number or a unique number for all the 4 records in the detail section. The unique number is shown in the header section in a text-field.
Now when I query (F11 and then Ctrl+F11) with the help of the unique number i see all the 4 records under it in the detail section. But when I query with the help of one of the 4 records in the detail section it says "fetching more than a single row." I know the same unique number is there for all the 4 records and in the header section I am displaying "number of items displayed" to be 1. That is why the error. But I want that to remain one. How exactly can I develop this functionality of querying the unique number in the header section from the detail block?
Please help as soon as possible.

Hi,
I'd suggest to check this tutorial:
http://www.oracle.com/technology/obe/obe_as_10g/bi/forms/formsmasterdetailobe.htm
Having a relationship between data blocks, coordinates dml actions in both, so no coding is needed to save/update/delete records, forms built-ins do the work.
hope this is useful,
Hugo

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