Dear Caetano Almeida
Duplicate Planned order is generated during Mrp Run in MD01N.If we run mrp in md02/MD01 duplicate planned order is not generating.
MD01N Run after MD04 screenshot

MD02/MD01 run and MD04 screen shoot

if we run again md01n duplicate planned order is generated,Note strategy 82 is used for this material.
If anyone have idea please provide the solution.