Does the Presbyterian Church in America (PCA) have a policy regarding admitting members who do not accept its doctrines?

According to the PCA 's _Book of Church Order_ and any other relevant material, should members wishing to join a Reformed church (PCA) be required to adopt its doctrines or should they be allowed to join if they do not accept the doctrines? On what doctrinal issues would somebody be denied membership, and on which might variance be allowed?