Hello Nadia
Did you use any relations between these tables, if so, the problems can be.
For example, let grid allowaddnew =.t. and one of the columns is from related table.
If we have few records in the main table and press down arrow ( add record )
this record will show reference from previous record, just we did set the key for reference. I used relations in 1997 for strings of trade papers ( goods with numbers and price descriptions) and refused from this idea to use related tables. I always founded some strange behaviour, similar to described by you , when did new record , just without allownew. One columns for related table has shown for second or so wrong reference. For long time after it I used other technic, I did find in Pinter letters .
I use query joining related tables for key from the main table, and make it not read only by -use dbf('query') again in 0
, makes my own updates back and show this query ( or queries ) in these grids. This works for me perfect in 50-60 forms of different tasks.
Vladimir