Ah, but you can do it. (Long, with example).
Actually, it can be done, sort of, as long as you don't have too many next actions for a particular project. Basically, you just keep changing the title of the same task, and adding a note in the notes section about what you did, or what information you got. This builds a history.
Say your project is "Get a dog," and your family decided to do this on Christmas day. (I'm using a simple project, obviously, you probably wouldn't want to go into this much detail for a project like this.)
Make a task called "Get a dog"
In the notes section, I would type: "12/25/04: Family decided to get a dog."
Say the next action on this project is to go to the libary and get dog books in order to find out what breeds are appropriate.
Change task title to: "Get a dog: Get dog books from library."
Category is @out and about.
Then, on 1/1/05, you went to the library and checked out dog breed books.
In the notes section, add, below the 12/25/04 entry,
"1/1/05: checked out dog books from library."
Say on 1/5/05 you read the dog books and they yielded Jack Russel and Poodle as ideal breeds, and you wanted to ask your friend Sally who has a poodle about hers.
Put in notes section (if you want to): "1/5/05: dog books said Poodle or Jack Russel are perfect for us."
Change title of task to "Get a Dog: Call Sally."
Etc. Keep changing the title to reflect the actual next action, and keep making little notes about what you did.
The notes end up looking like this: (This is an actual project) Note the advantages from a CYA perspective, without having to shuffle through a million emails.
Task title: "Client5: Partnership Amendment (waiting for signatures)"
[current category: @waiting for]
5/10/04: Need to get copy of Pp agt. Ask A if she has it. If not, call B- 310-xxx-xxxx
5/10/04: B said we should have the agreement. I asked A to have the boxes sent to me.
5/20/04: Spoke with M. She said to go ahead with division. Need to call B to get copies of Pp docs, call S and tell him I"m going ahead.
5/26/04: talked to B again, told him to dig up partnership docs. Lm for S re this.
5/27/04: B said he is sending docs.
6/8/04: Sent amendment and cover letter to M for review and comment.
7/12/04: emailed M re status.
7/26/04: talked to M about this. She said she would review it.
8/4/04: emailed M again with another copy of it.
8/30/04: M's client agrees, as long as trust won't lose creditor priority. I emailed J. Jsays no priority to begin with.
8/31/04: I left vm for M's client saying this.
9/2/04: talked with M - forgot what her question was -- priority wrt something else.
9/7/04: Left M a vm to call me.
9/9/04: sent amendment to M's client for signature.
9/24/04: last week, M's client sent in her signature.
9/27/04: Sent to Stanley for his signature.
9/27/04: Received C's sig. Waiting for S and other partners.
10/8/04: S and C signed the amendment; S took the original to get signatures of other partners.
10/20/04: S said he's still working on it.
11/29/04: Gave Y letter again to send second copy to S.
2/24/05: reminded S re sigs.
5/?/05: Told S to call R. Have received all but his signature.
Notes like this tend to get unwieldy if there are many next actions for a project that are intertwined. But I've found this works REALLY well for projects and sub projects that are pretty discrete.
Hope that helps.
Taxgeek