Show Value on float

Hi Good day. Can someone assist me regarding my concern on Float value. I try to make 2 float fields namely CBM one is in the item doctype and the other one is in the quotation item doctype. i would like to ask how will i get the value that i input in my CBM field to show in quoation item CBM field also with read only function. Cause it always shows 0 value. It doesnt change according to what i input in CBM field thanks.

What version of ERPnext and frappe are you using ?

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HI root im using frappe version 12 development for this.