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There is a pause for the user to enter the check date. That could be a
problem. I like your idea of immediate update, and then subtract one in
case the user cancels out.

Envision this scenario:
User 1
  co chain  control  (gets check 1000)
     add    1       check
     update control  (check is 1001)
     exfmt
... go to lunch

User 2
  co chain  control  (gets check 1001)
     add    1       check
     update control  (check is 1002)
     exfmt
     update detail   (check is 1002)

User 1
... back from lunch
... cancels out
  co chain  control  (gets check 1002)
     sub    1       check
     update control  (check is 1001)

User 3
  co chain  control  (gets check 1001)
     add    1       check
     update control  (check is 1002)
     exfmt
     update detail   (check is 1002)
... duplicate check in detail!

WHy is the DATA AREA considered, "safer"
> than a file in this scenario?

Who said it was safer?
  --buck

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