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Based off [sawa's comment from this
question](https://japanese.stackexchange.com/q/3478/542):

> "you cannot have two ...に phrases. Remove either."

And using the same verb "同意する", I looked up the dictionary and found:

> 1.（人）に同意する - to agree with a person
>
> 2.（意見・提案・計画など）に同意する - to agree with an opinion/suggestion/plan/etc.

Let's say I agree with a person about an opinion/suggestion/plan that does not
necessarily belong to that person. This way I'm **not** using the genitive-の
to connect the parts together as in `(人)の(意見・提案・計画)に同意する`. Instead I'm trying
to express that I agree with a person with something.

Deducing from the above dictionary excerpt, I would form a sentence with two
`に`s (Which I now know is wrong from sawa's comment).

Flawed (pun not intended) attempts at constructing the sentence:

> ｘ 私は計画に彼に同意します
>
> ｘ この計画が彼に同意します (I just realised that this means "This plan agrees with him"
> (Unless sarcasm is taken into consideration, this sentence cannot make any
> sense))

**(Question)** What would be the proper way to construct this sentence?
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grammar particle-に
How to resolve two indirect objects? (Prohibition of two に in a sentence?)
After doing some reading up, here's what I learned.

Two にs in a sentence like `私は計画に彼に同意します` cannot be allowed because `計画` and
`彼` will share the same thematic role1 if both are assigned に. This causes a
problem because `同意する` can only assign two roles - `Agent(私)` and
`Theme(Either 彼 or 計画)`

Breaking down the sentence "I agree with him on this plan." yields:

> Main verb: agree
>
> Agent : I
>
> Theme: him
>
> Location (Abstract location): plan

Now using the above, I will try to build the Japanese version of the sentence.

> Main verb: 同意する
>
> Agent (marked by は in this case): 私
>
> Theme (marked by に): 彼
>
> Location (marked by で for location of verb action): 計画

Putting them together I'll get `私はこの計画で彼に同意する`.

* * *

1: Here is a list of the major thematic relations extracted from
[Wikipedia](http://en.wikipedia.org/wiki/Thematic_relations):

> **Agent** : deliberately performs the action
>
> **Experiencer** : the entity that receives sensory or emotional input.
>
> **Theme** : undergoes the action but does not change its state (Sometimes
> used interchangeably with patient.)
>
> **Patient** : undergoes the action and changes its state (Sometimes used
> interchangeably with theme.)
>
> **Instrument** : used to carry out the action
>
> **Force or Natural Cause** : mindlessly performs the action
>
> **Location** : where the action occurs
>
> **Direction or Goal** : where the action is directed towards
>
> **Recipient** : a special kind of goal associated with verbs expressing a
> change in ownership, possession.
>
> **Source or Origin** : where the action originated
>
> **Time** : the time at which the action occurs
>
> **Beneficiary** : the entity for whose benefit the action occurs
>
> **Manner** : the way in which an action is carried out
>
> **Purpose** : the reason for which an action is performed
>
> **Cause** : what caused the action to occur in the first place; not for
> what, rather because of what
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I disagree with premiss as stated - most real written sentences are composed
of clauses containing verbs. You're going to see lots of "に" in a variety of
roles. Multiple verbs can mean multiple indirect and direct objects. Yes, each
verb has at most one of each, but good luck determining what goes where.
Despite my decent vocabulary and grammar knowledge I am frequently stumped by
what are surly ordinary news stories. "I agreed with Bob when he said that the
plans we had agreed to last year were obsolete, but I can't agree with his
attitude" is more Japanese than English.
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2012-07-12T20:49:19.090
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Three formulations that, I believe, are natural:

この計画につき(まして)、彼に同意します。

この計画の件なのですけれども、彼に同意します。

彼のように、この計画に同意します。
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