例えば以下カスタム項目の場合:
Web-to-ケース あるいは Web-to-リードの formで、
<input type="hidden" id="00N10000000xxxx" name="00N10000000xxxx" value="1回目" />
<input type="hidden" id="00N10000000xxxx" name="00N10000000xxxx" value="2回目" />
<input type="hidden" id="00N10000000xxxx" name="00N10000000xxxx" value="3回目" />
のように同じIDを複数回使用してPOSTを行った場合、次のようにセミコロンで連結された形で該当の項目にデータが作成されます。
1回目;2回目;3回目
現在、このようにデータの格納は行われますが同じ項目form内で複数回利用するのは推奨できる使用法ではなく将来的に予告なく動作が変わる可能性もあります。もし上記のような実装が行われている場合には、修正を検討してください。
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