eCATT RAISE EXCEPTION error during multiple record processing

I wish to load records to a table via an in-house-written ABAP program. This program consists of a main screen and multiple sub-screens. I am submitting an Excel spreadsheet as input. The eCATT configuration successfully runs the TCD script for alternate records. For every other record that is processed, a RAISE EXCEPTION error occurs. If an even number of records is submitted, the same result occurs upon multiple re-submissions. If an odd number of records is resubmitted, the RAISE EXCEPTION error occurs on opposite records from the previous submission. For example,

Submission #1: Re-submit #1:

1. success 1. success

2. RAISE EXCEPTION 2. RAISE EXCEPTION

3. success 3. success

4. RAISE EXCEPTION 4. RAISE EXCEPTION

Submission #2: Re-submit #2:

1. success 1. RAISE EXCEPTION

2. RAISE EXCEPTION 2. success

3. success 3. RAISE EXCEPTION

Any suggestions to resolve this would be much appreciated.