DD Software - Bank Rejection


Good Morning

I am looking for some advice please.

Our DD file was rejected by the Bank on Friday.   Nothing obvious is coming back and the Bank are not able to tell me why it was rejected.  Only option is to cancel the 105 payment transactions and start again in batches to try and identify which customer information is causing the problem.

My questions are: 

1   All the payments have been allocated against invoices.  Can I just delete the transactions without first unallocating the payments?

2   Is there a way of selecting all 105 transactions together rather than going into each one individually.  When I go into Transactions I cannot see any way of selecting more than one item.  

Thank you