I know that taking full responsibility for one's mistakes is considered the best policy, but I am in a situation where I feel that doing so would not be entirely accurate.
About a year ago, I was assigned with a task to write a draft text to use in an official company presentation - I was told at that time not to focus too much on it and to just lay out the bigger picture. A draft, not a final version. I did my very best at that time, but also took into account other tasks that had higher priority.
Many months later, after I had been promoted to a different role, many of my drafts were actually used in print material. And today someone pointed out that there was a huge mistake in the text I had written (which makes our product sound inferior!).
It was my mistake, but I hadn't entirely finished or proofread that work.
Should I say "Sorry, it was my mistake and I'll correct it. We didn't prioritize this work too much when we wrote it so I didn't spend too much time on it"? Or should I just omit the second phrase?
EDIT: ok, it's a bit more difficult actually. Shortly before they published, I vaguely remember someone asking me informally if I was happy with what I had written and if it was ok to publish. And I said "yes, sure" without properly checking :(