When the ReSA System Option to check for duplicate/missing transactions is enabled, tdup* file is used to keep TRACK of the TRANSACTION numbers (tran_no) used. When a RTLOG file is uploaded then a tdup* file is created. It is created for a STORE (i.e. tdup.dat). When some new RTLOG file is uploaded for this store then the tdup* file will be appended. Note that tdup* file is created for a Store not for a Store/Day. It is never DELETED through any batch. Depending on the Store's "Unique Tran.No. By" setup - Register or Store; tdup* file contains the Store/Day, Register and the Transaction NUMBER information. It ensures that no duplicate transaction can be loaded.

When the ReSA System Option to check for duplicate/missing transactions is enabled, tdup* file is used to keep track of the transaction numbers (tran_no) used. When a RTLOG file is uploaded then a tdup* file is created. It is created for a Store (i.e. tdup.dat). When some new RTLOG file is uploaded for this store then the tdup* file will be appended. Note that tdup* file is created for a Store not for a Store/Day. It is never deleted through any batch. Depending on the Store's "Unique Tran.No. By" setup - Register or Store; tdup* file contains the Store/Day, Register and the Transaction number information. It ensures that no duplicate transaction can be loaded.