PC Business unit & Activity are not being populated at Journal level for the Journal ID which is be

Dear All,

PC Business unit and Activity id  are not being populated at the Jounral level. PC Bu, Project  ID and Activity ID are avaialble at BI_Acct_entry record level.

I had run the Generate journals process for "BIDEFN" , Project ID is being populated but the project ID and Activity id is not being populated at the Journal line level.

At Accounting entry Definition level (BIDEFN), i am try to add the PC Business unit in Chartfield mapping but the corresponding chartfield (PC Business Unit ) is not available in the drop down list.

Can you please suggest on this.