MRP Run in MD01 and MD03 is different

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Dears,

I am new to MRP processes. Maybe the problem is trivial maybe not.

We have a 9 000 spare parts and would like to use a limited MRP to help operators to know which number of spare parts is coming to shortage.

I set material master and made some settings in customizing for the plant I use.

After that I choose one material which stock is below reorder point.

I run MD03 and system works fine - it creates a planned order.

However when I run MD01 (or se38 ->RMMRP000) with the same parameters as for MD03 , the system creates nothing. Only telling that MRP was run and which parameters I choose.

I run MD16 to see maybe there are some planned order that system created and did not tell me, but nothing as well.

Only MD03 works if I choose the material. However, collective run MD01 is not working. 😔

Any ideas?