I don`t like to repeat myself ... !!
The same wiki says :
" It is generally accepted by scholars that the official Indian account of the signing of the accession document by Kashmir's maharaja - that it was signed in Jammu on 26 October 1947 - is inaccurate "
Alastair Lamb (in his book, Kashmir - A disputed legacy 1846-1990) points out that the Instrument of Accession could not have been signed by the Mahrajah on 26th October as he was travelling by road to Jammu (a distance of over 350 Km). There is no evidence to suggest that a meeting or communication of any kind took place on 26th October 1947. In fact it was on 27th October 1947 that the Mahrajah was informed by his MC Mahajan and VP Menon (who had flown into Srinagar), the the Instrument of Accession had already been negotiated in Dehli. The Mahrajah did not in fact sign the Instrument of Accession, if at all, until 27th October 1947. This sheds doubts on the actions of the Indian regime
Moreover, further shedding doubt on the treaty`s validity, in 1995 Indian authorities claimed that the original copy of the treaty (letter of accession) was either stolen or lost !!!
This "Accession Document" was neither shown to UN , nor to Pakistan ....... So this alleged "accession document" carries no significance ....