Altronus Level 1 attack is wrong?

[Steve the Conjurer]

So looking at the pregens, Altronus a level 1 solarion has the following attack listed.

Melee solar weapon +4 (1d6+2 S)

My question is HOW?

Str = 14 (+2)
BAB =1

Shouldn't it be +3 to hit (BAB+ STR)? Is this an error or am I missing something?

[quindraco]

Altronus has Weapon Focus (advanced melee).