Why does planning indicators change when the safety stock change?

Hai All,
          I created a BOM for a finished material (FM1)and entered another finished material(FM2) in item list.
Now in MRP, I did single item  multi level planning for the FM1. I checked the planning file entry through MD21 and it has NECH and NECPL marked. I checked for FM2. None of the indicators are set. Then I have been to material master for FM2 and in MRP2 screen and changed the safety stock to 950. Then I checked the plannig file again and I see the indicators NECH and NETPL are checked. I then made the safety stock 0 and checked the planning file. There is no change.
My question is why were the indicators NETCH and NETPL checked when I increased my safety stock for material FM2 from 0 to 950?
I understand that NETCH is the planning for Net changes and NETPL is for planning for changes in a horizon.
Are these indicators set because I made a change to the material? or is there any other reason?
Thank you.

Visu
The planning indicators change when there is an amendment to the planning situation that requires MRP to replan a material. Essentially, by upping your safety stock from 0 to 950 you are requesting that the MRP system replans that material to ensure that there is sufficient safety stock available.
Hope this helps
Ian

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