Hi, thank you for your suggestions.
I tried all of your suggestion, but still did not get what i desired.
Let me show you the result i get so far,
1. Original Result before any amendment: INV-0001
2. Result after amendment as per Paul: INV-0001
3. Result after amendment as per Graham: DO-INV-0001
Hope you can help to identify where goes wrong please.
thanks again.
Boon Lai
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