Melon field, under a plum tree

Melon field, under a plum tree — One of the meanings of this proverb could be… Stepping into a melon field, standing under a plum tree (, such behavior causes misunderstanding that you want to steal those fruits); implying that you must avoid actions which could be taken on a bad faith. Source: a shortened passage from a poetry of ??? (Liou) (This is a Japanese proverb, saying, or idiom)