ms access - Have autonumbered column restart value from 1 after primary key value changes? -

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i have 2 tables, call them po , po_li. there column in po called po# primary key, , in 1 many relationship po# column in po_li (the 1 being in po). in po_li, other columns line#, description , lineamount.

how can reset number 1 every new po #?
can done while still using autonumber?
can done in ms-access gui or vba code required?

you cannot manually edit autonumber field or change starting value. best bet maybe use vba max line number , increment it, , if you're using new po start @ 1. put vba in afterupdate event of po field.

you this:

dim db database dim rec recordset dim rec2 recordset dim myval integer  set db = currentdb set rec = db.openrecordset("select linenum mytable po = '" & me.txtpo & "' group po")  'if there no records returned, start @ 1.  otherwise, increment. if rec.eof = true   myval = 1 else   set rec = db.openrecordset("select max(linenum) mytable po = '" & me.txtpo & "'")   myval = rec(0) + 1 endif

myval number write linenum. of course, you'll need change variables , such what's on forms , in tables, should idea.


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