Absence Type Validation Fast Formula : Seeded Rule

Summary

Order of execution of seeded rule and custom Absence Type Validation Fast Formula

Content

Hello Experts,

Here is my understanding, when we submit an absence there are seeded validation rules that gets triggered automatically and we get an error accordingly. However when i attach an custom Absence Type Validation Fast formula , the fast formula gets triggered first and i assume seeded rules follows if the criteria in ff is satisfied. 

Please advise whether there are options to change the order of execution of the seeded and FF rules when we submit an absence ?

thanks,