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Another workaround that works most of the time within Eclipse-based Designer is to put the focus somewhere in the relevant class code and press <ctrl>+<alt>+L to enter the line number.
That said, I agree with you that this issue should be resolved, along with other quirks of the LotusScript editor.
Actually, with ODP the workaround is somewhat easier. You just need to open the script file (usually something with .lss suffix) and open it with any text editor that show a line number on the left side. I agree with the need to fix this since it would mean less time in searching the errr and more time for fixing said error.
Tinus Riyanto - Prisma Global Solusi