Message SAP WT129 - Target stock is calculated dynamically. Your entry will be ignored

Diagnosis
The MRP type for this recipient thatthe target stock should be calculated dynamically during thereplenishment planning run.

System Response
The system ignores your entry.

Procedure
If you want the system to use the target stock you entered nonetheless,you must assign the material an MRP type for this recipient, wherebythe field Forecast indicator has a value other than '+'(compulsory forecast).