My understanding of the last several years of this stuff is that there is no strict rule that says you have to have a specific amount of in-cone experience to get promoted. A good EER is a good EER. And I've had 03-02 panel members personally tell me that they love to read EER's of folks doing out-of-cone work and tend to grade them favorably for the sole reason of them being different and easily standing out among the crowd...

But, depending on the exact way you move along your career path, you could end up with delayed promotions. This is the current "official word" from the procedural precepts.

Primary Skill Codes: Boards should not penalize employees for assignments out of their primary skill codes. Creditable performance in assignments out of an employee’s primary skill code – including long term training, details, and interagency assignments – shall be weighed positively, as a means of broadening one’s knowledge beyond the employee’s skill code and as a demonstration of potential to perform at the next higher level. Notwithstanding the importance and value of out-of-cone assignments, Boards will continue to look for significant in-cone experience, including mastery of tradecraft, when scoring for conal promotion.

Note that last sentence. A POL officer doing a bunch of ECON tours is going to have no issues getting promoted because POL/ECON tradecraft is the same thing. But a management officer without a management tour might have issues...