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入れなくては

must include

→ 入れる
phrase Rare #32,654
must include Often followed by ならない or いけない to express obligation: 入れなくてはならない means “must include” or “must take into account.” Literally, it is the negative conditional form of 入れる, “if [someone] does not put/include.”
JA: この情報も報告書に入れなくてはならない。
EN: We must include this information in the report.

ほとんど空なのでガソリンを入れなくてはなりません。

The tank is almost empty, so I need to get gas.

私たちはこの問題を考慮に入れなくてはならない。

We have to take this issue into consideration.

彼の試験を採点する前に、彼が病気だったことを考慮に入れなくてはならない。

Before grading his exam, we have to take into account that he was sick.