適格 てきかく請求 せいきゅう しょ とう保存 ほぞん方式 ほうしきだったら
tekikakuseikyū shotō hozonhōshikidattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 適格請求書等保存方式

1. If/when it were a qualified invoice preservation method.; If/when it was a qualified invoice preservation method.

Tara Conditional
Law