Duplicate entries in instruments file

manojmo
hi,
i am processing the instruments file myself, and i found the below 2 duplicate entries, i.e. for the same security(875PFL26) and exchange (BSE).
I don't really need these, as they don't appear to be a stock, so i will check for name not empty(4th column)
When can this happen ?

249511172,974653,875PFL26,,0,,0,0.01,1,EQ,BSE,BSE
249544964,974785,875PFL26,,0,,0,0.01,1,EQ,BSE,BSE
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