You can, but shouldn't. All data in a table must identify the key. Foreign
Keys, which are the keys from IDTable1 (in Table2) should be a separate
field in table 2, and no field should be combined.

Using Access's built in subform system, you automatically generate the
linking value when you create the subform record.
--
Arvin Meyer, MCP, MVP
http://www.datastrat.com
http://www.accessmvp.com
http://www.mvps.org/access


"Frank" wrote in message
...

I have Table 1 with Field IDTable1 [autonumber] [and other fields] and
Table
2 with Field IDTable2 [autonumber] and Field GRV set to text [and other
Fields]
Is the following posibble:
Can I automatically generate a number that can be used in GRV field of
Table
2 consisting out of a combination of IDTable1 and IDTable2 written as
IDTable1/IDTable2 in the GV field of Table 2

I want this GRV number as a unique number identifying Table 1 and Table 2

Thanks for the help