If you have possession and sale deed,  undivided share on your name so need to worry about it. 

Get the Index II of the flat which is on your name. 

If sale deed has been executed on basis of POA you would be absolute owner of property 

2) the consideration paid by you would be mentioned in sale deed  

you don’t need allotment letter if sale deed deed is executed in your favour 

It should be enough to effect the sale deed but if still not feasible you need to approach the court for appropriate directions

Greetings!!

Once the plot is registered in your name and legal formalities is completed then you dont have to worry on allotment letter as the allotment letter is the initial proceedings proceded by the builder to the customer ; if the letter is lost you dont have to worry after registration of sale deed your the absolute owner for the said plot..

See since 1995 if undivided share is there and property tax bill is in your name you can make a sale deed based on same along with the share certificate.

Allotment letter can be substituted by agreement to sell. Just cross verify, chain of documents and clear title.

1.  IF you have executed a duly Stamp Duty paid and Registered "Sale Deed", THEN it is a final Title-Ownership conveyance document and there is nothing further needed atleast legally.

2.  Maintain & Preserve the payment details, Bank certificate of the payments, records of the property as maybe given by Tahsildar /Municipal authorities.

- An allotement letter is issued by the Builder to the buyer , when the property is under-construction , and it is a proof of payment , till the registeration of sale deed of the said property in the name of buyer.

- Hence, for the registeraton purposes , there is no requirement for Allotment Letter as per law , if the payment already acceptable by the seller/builder.

- Once the property will be registered before the Registrar , you will become the absolute owner of the same.

you are absolute owner of said property, there is no need of allotment letter. 

An allotment letter is an important document meant for the buyer. 

Yes the registered sales deed of undivided share in enough for selling your flat.

You catch hold of the builder and get the allotment letter which is a very vital document for purchase of the flat.

What is your advocate's opinion about this?

Is he recommending to buy the property without the allotment letter?

If so, then it is a wrong advise.

The allotment letter is one among the vital documents that the builder has to provide while selling the flat.

You may issue a letter to the builder in this regard.

You can take legal action against the builder if he is not cooperating on this after receiving the entire sale consideration amount.

If the flat was bought in the year 1995 what were you doing all these period, i.e., for more than two decades?

Without allotment letter how did you get this particular  flat ?

You may not be able to sell the property to the prospective buyer with deficient documents.