Access Relationship Question

Nov 16, 2006

Hi all,

I'm just putting a database together, and I'm having a relationship "issue". It's fairly simple right now, but I'm not sure if you can do what I am trying to do..

Basically I have, so far, 3 tables. Each one has a primary key "Serial #".

There's a "Systems" table, a "Parts" table, and a "cash flow" table. I have a link from

Systems - Cash Flow
Parts - Cash flow
Both links are set to enforce referential integrity (with cascade update/delete enabled as well).

What I want it to do is work so that I can add new values to either the Systems or Parts table, with their own unique "Serial #" code, and then be able to add the value to the cash flow table.

Currently, I can add items to the "Systems" table, and then add the corrosponding entry into CashFlow, and that's fine. If I try and input an invalid entry, it will tell me that the appropriate entry does not exist in "Systems".

However, I cannot add anything to "Parts", since it gives the error that the appropriate entry does not exist in CashFlow. Obviously, I need to make it in Parts first, and even if I wanted to make it in CashFlow first, it wouldn't let me (entry does not exist in "Systems").

I have tried fiddling with the relationships, but I get other problems like not being able to add items to "Systems", etc. If I try and drag "Parts" to "CashFlow" the other way (in the relationship), it tells me that I cannot do that because it violates the integrity rules.

I can see WHAT the problem is, and I know WHY it's doing it, I just don't know how to fix it.

Basically, I want the field "Serial #" in the table "Cash Flow" to be able to draw from the field "Serial #" in either Parts or Systems, but reject anything else (in other words, incorrect serial numbers, since the item shouldn't be in the cash flow table until it has been registered as an item in either "Parts" or "Systems").

Any ideas? :)

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