I checked what you said and saw I already put a condition Status=Active on the Setup.
But when I was playing around, I recognized that:
1) In the design of BP_A under the "Auto creation processes -> Detail form", "Auto-populate from Line Item to Upper Form" check box is unchecked.
2) I did not put "creator_id" and "uuu_creation_date" fields on the upper form of BP_B.
After I fix these issues and re-deploy both of the processes it started to work.
Thanks for the answer.