Enqueue with multiple secondary tables

I have an enqueue object that locks one primary table and several related secondary tables. When I call the FM using the key of the primary table I notice that I cannot open any secondary table record in change mode in an alternative transaction. It's as if each secondary table has been entirely locked.
I was expecting that only those records in any secondary table whose foreign key matches the key of the primary table would be locked.
How do I lock only the set of related records based on the key of the primary table without having to loop at each related secondary table record and locking these in turn? I mean, I know I could do this, but is that really the only way?
How does SAP manage this problem?

Sandra
Ok, so I created the tables and locks from scratch. The only thing I did differently was to run the enqueue FM's via SM37 so I don't have to create 2 new test programs. I am still getting the same results as before.
This is my dummy Table T1 (key = ZF1)
ZF1    |    ZF2    |   ZF3
0001   |    A      |    AA
0002   |    B      |   BB
0003   |    C      |   CC
0004   |    D      |   DD
0005   |    E       |   EE
This is my dummy Table T2 (key = ZF4 + ZF1; FK = ZF1)
ZF4     |   ZF1      |    ZF5
2001    |   0001    |     AA
2002    |   0001    |     AB
2003   |    0002    |     AC
2004    |   0001    |     AD
2005    |   0003    |     AE
2006    |   0004    |     AF
2006    |   0005    |     AG
2007    |   0005    |     AH
There are also 2 enqueue FM's. E1 locks T1 & T2; E2 locks only T2. When I execute E1 where T1-ZF1 = 0001 I expect that the foreign key relationship in T2 would mean I also lock T2 where ZF4 = 2001, 2002 and 2004. Yet for example, when I execute E2 with T2-ZF4 = 2007 in another session this triggers a lock conflict.
The only way I can request a successful lock on T2 when I have already called E1 is to fully qualify all of the E2 FM parameters. For example, if I call the E2 where T2-ZF4 = 2007 and T2-ZF1 = 0005 then the request is Ok.

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HI Gurus,
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Thanks for your response.
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Hi Experts,
i have one doubt in joins
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I posted a query on Importing data from Microsoft Excel to Oracle Database (Multiple Data Tables). I got some answer and reference from the forum.
I presented to my Oracle consultant and representative from Oracle Malaysia. They said impossible. I do not believe what they said. I do believe can be done.
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We don't know what "some answer and reference" you received "from the forum."
We don't know what it was that your "Oracle consultant and representative from Oracle Malaysia" said was "impossible".
So on what basis are we supposed to "help or direct" to "to an expert that can help "?

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You must use the alias name, not the table name.
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http://www.oraclebidwh.com/2010/10/obiee-bmm-layer-design-principalsbest-practices/
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Hy i'am trying to populate my gridview from multiple tables
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