Sir,
FDI, it can 't be.
Here is what must be happening. TATA has got access to technology here, the company giving access to the technology would have already walked away with handsome money in exchange of the tech. Further, each piece of this howitzer sold to the IA, the co. transferring tech would have a cut and quite possible for now the deal would have pretty much benefited the company which is providing the tech.
For TATA, they now have access to the tech which they can call their own, they can further develop the tech over a period of time, rights to sell this product under their brand name in the Indian market, and quite possible some sort of a back door nod from the MoD that they might get "x" number of order, else it looks at little pointless as to why would someone risk so much investment.
TATAs should stand to benefit if they get "x" number of order, a break-even should definitely happen and I am not expecting the prices to drop significantly, at least for the initial orders, and since they would have sneaked in into the IA market, they would definitely stand to gain more such orders in the long run. For India and the IA, the supplier changes, from foreign shores, it moves to a supplier within India, a more reliable option at the time of war, I would imagine.