Shafi, the only requirement is you would have to complete associate to write professional exam. Not else other than that, so you are good to write the professional exam if you have complete the associate exam.
Please let me know if this information helps
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Just to add on to what Prasanna has shared, as a guideline its recommended to have ~12mths product experience before going for the Certified Professional exam. Lots more detail at the homepage below...
Best of luck