Using the expression "the same" for a previously mentioned item

I frequently use "the same" as in the following sentence.

I need the details of XYZ project. Could you please send me the same as soon as possible?

Is this grammatically correct? I have not been corrected till now, but I have not seen the usage from native speakers very much either.

Update:

Seems like my example sentence was ambiguous. Hope the following sentence is better.

I need the documents for the meeting. Could you please send me the same as soon as possible?

The first time I saw it was from an Indian colleague in 2009, and I've only ever seen it in emails or instant messages from Indian colleagues since.

An example:

The document is dated 25/06/08/ Is there any updation to the same?

Another:

could u tell me the command for executing the unit test from command line or any link or ppt .. for the same

As a British English speaker from the UK, I found it a bit strange at first, but I've got used to it now. However, I wouldn't advise using "the same" in this way as it might not be understood by people not familiar with it. Instead, when the context is clear, use a simple "it" or "them". If the context isn't clear, state explicitly what you mean.

So I would change your (updated) example:

I need the documents for the meeting. Could you please send me the same as soon as possible.

To:

I need the documents for the meeting. Please could you send them to me as soon as possible?

Also note the second sentence is a question, so ends with a question mark.

Grammatically it's unexceptionable, but it is rather formal for normal chat (such as email).

This is correct usage. "the same" or "same", used as a noun, is a placeholder for the object of the previous sentence or clause; here, "the details of XYZ project". IME it's not common colloquially, but in business communication it's everywhere.

This kind of use of "the same" is very frequently used in patent texts. For example: "Method for producing a laminated object and apparatus for producing the same"

https://www.google.com/patents/US5985202

It is OED (sense 4a) of the pronounal form of same.

4.a. the same, †that (or this) same: the aforesaid person or thing. Often merely the equivalent of a personal pronoun; he, she, it, they. Now rare in literary use; still common in legal documents; also (with reference to things) in commercial language (where the is sometimes omitted). Cf. German der-, die-, dasselbe.

Examples exist from the 14th century, but the two most recent ones are as follows:

1966 G. W. Turner Eng. Lang. in Austral. & N.Z. vi. 135 A different influence of written language is seen in the use of same as a pronoun equivalent to it, as in ‘put the tailboard up and secure same with a length of wire’ from New Zealand (Wally Crump, 1964), a facetious borrowing of lawyer's English which is quite common.

1973 N.Y. Law Jrnl. 24 July 4/4 The following sentence in a brief is typical of its misuse as a noun: ‘Waldbaum purchased the soda..then stacked it on the shelves in order to sell the same.’