ACCA F9 CROSS OVER PAPER

Good Afternoon Mr / Ms. Tutor.

I am told that once a student clears the F9 paper, he / she can cross over into the Ps even though they still have a paper to write in F .

I currently have F7 and F9 to write and plan on sitting for one paper. What i want to know is if i had to sit for F9 and clear it this sitting, can be allowed to attempt Ps ?

Thanks in Advance