Unable to post and clear customer line items through Lockbox

Dear Team,

In our implementation project we have done lockbox configuration and

doing 820 EDI (Inbound).

The required prerequisites for IDOC creation has been done in the

system:

1. Posted 5000USD customer invoice through FB70 for customer 21

2. Generated test file through program “RFEBLBT2”

3. Upload the same test file in FLB2

4. Created the testing tool for basic type “FINSTA01”

5. Maintained all fields with segments and generated the standard

inbound”3702503”

But in this IDOC number I faced an error message “Table T049A does not

have an entry with key”, but when I checked the lockbox configuration

everything is fine. Due to this error I am unable to post and clear the

customer line items through lockbox.

In T049A already house bank, account ID, Bank GL account, bank clearing

account are updated properly and showing in table level also why system

Regards,

Ravi