help in database design

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hi all,

i need help in design a database, our office is hospital equipment supplier,
we had a list of items, each items had it's own configuration, and
each item could consist of several item. we also had contract that
have a lot of site, sometimes equipmend that have been ordered
different from what the site received, in that case we made a change
request...

for now we have this

|contract|------|has|-----|site|
                      |
                      |
                  |item|----|material|
                      |
                      |
             |configuration|

but i really confused about the Change Request thing, we have to keep
both what have been ordered and what have been received... where
should i put it, sorri for my bad english

tq


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