Set parameter "B,D" for Rebar Shape

Revit
1

Hi Guys
When I set parameter A , B for Top layer rebar it is move = Value set is "300"can help me fix the problem for still keep potion for top rebar
Thanks for help!

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2

Hi. You need to set the constraints correctly.

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Thanks @Einar_Raknes reply
how to be able to set the constraints correctly.Look forward to your help in this case thanks