yes, the transaction file (sisub.dbf) is in the current work area.
Do you suggest me to remove all tables from the data environment and put it again in the sequence that:

1. Master file ( simain.dbf) work area 1
2. Transaction file ( sisub.dbf ) work area 2
3. Party Name file ( pcode.dbf ) work area 3
4. Item Code file ( icode.dbf ) work area 4

please suggest