What level

[Anditch]

To gain access into a prestige class. If it says that you need a base attack of say of 7 and you are a 6th level warrior. Can you get into that prestige class at 7th or do you have to level to 7th then gain the prestige making your a 7th level warrior and a 1st level prestige char even if the prestige class that you are entering gives you a +1 base at 1st level.

 

[Crothian]

you need to have the requirements before going into the class, so you have to be fighter 7 for the BAB of 7 to make it into the first one