I want to access a mnemonic in a datablock

Hello, I want to access a mnemonic in a datablock, with the path specified as follows: 'DB_D_IO_THIS{i}.Mnemonic'. I want the variable 'i' to take its value from the path 'E1.Pos[0].Entr0_Av_Pos[0]'. I've tried the code below; it works the first time, but when I change 'i', the output value doesn't change.

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Split from WinCC Advanced v17: trying to access the values in the array.