梵網經菩薩戒本疏 6.180

6.180

五、闕緣者，謂一、三無犯，二、四得方便，可知。

Fifth, on deficiency of conditions: when conditions 1 or 3 are deficient, there is no offense; when 2 or 4 are deficient, one incurs a preparatory [offense], as can be understood.