The DOS Case ID is identified as IV Case Number on the Visa Stamp, but has two additional numbers at the end, such as 01 or 02. When entering the IV Case Number as the DOS Case ID into the USCIS online filing system, do not include the last two numbers. For example: if your IV Case Number is ABC1234567801, you would not include the 01 and enter your DOS Case ID as ABC12345678.
Need help on ellis.gov - Dos case id wont fit
in Bringing Family Members of US Citizens to America
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This is the answer I got from USCIS:
The DOS Case ID is identified as IV Case Number on the Visa Stamp, but has two additional numbers at the end, such as 01 or 02. When entering the IV Case Number as the DOS Case ID into the USCIS online filing system, do not include the last two numbers. For example: if your IV Case Number is ABC1234567801, you would not include the 01 and enter your DOS Case ID as ABC12345678.