[AccessD] Anyone There?

Welcome back, Ginny!
 
You have to make a decision about who assigns the numbers: users or the
system. It reads as if you want the latter, but the problem may be that the
existing numbers may not conform to the rules. The solution is: who cares?
Accept all existing entries as valid and proceed from there.
 
IMO you are best off normalizing these virtual columns into actual columns.
Why? Ease of coding. For example, given inputs such as:
 
DC-2101-0001
DC-2204-0001
DC-2301-0001
LA-2605-0001
LA-2605-0002
LA-2605-0003
NR-2605-0001
 
IMO these three parts belong in separate columns. It looks like the first
column is a table of a very few entries. The second column is... who knows?
Input? Derived? Doesn't much matter, but if derived it can be a lookup.
Column 3 is also derived, something like =Format(DMax("myPK", "myTable",
"myParentPK = " & nnnn), myLeadingZeroesFormat ). 
 
Write a function that returns the next ChildID something like this:
 
Function NextChildID( strPK as String, strTable as String, strParentKey as
String, lngParentKey as Long ) As Long
    Dim lngLastID as Long
    lngLastID = DMax( strPK, strTable, strParentKey & "=" & lngParentKey )
    NextChildID = lngLastID + 1
End Function
 
Invoke it in the BeforeInsert event of the form.
 
Arthur

 

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