There's no such thing as a BMP-4. Did you mean BMD-4? That would make no sense. It's a crappier version of the BMP-3, with air-droppability.
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Typo error, should be BTR-4.
Anyway significant procurement of any wheeled amphibious armoured vehicles, will have to factor what's the development of Pindad amphibious wheeled vehicle. If Pindad failed to make decent amphibious Anoa or from any other version of their wheeled armoured vehicle design, then the Marines can get more leeway for significant procurement of foreign dedign wheeled
amphibious vehicles.
It also potentially on the table, that Ukraine also forwarding their BTR-4 design to Pindad. As the Naval Chief already put, that there was an MOU for further collaboration with Pindad on BMP-3F local manufacturing, which related to further procurement of BMP-3F in the future. This again show strong importance of any join manufacturing deal with Pindad or other local manufactures in order to secure long term significant procurement deal with Indonesian Armed Forces.
However rumours that circulate on local media and forum, and from what I heard from Pindad team, Pindad it self are not really impressed with Ukraine design and manufacturing quality. This show up after their team assessed Bulat and Oplot MBT.
Korea so far has shown stronger relationship with Pindad. I don't know how far the progress between Samsung Techwin and Pindad on LVT-7, but personally I still think possibility still there for LVT-7 in the end turn out to be the real replacement for BTR-50 within Indonesian Marines inventory.
As mentioned before, untill the ink already signed on the contract, any last minutes changes on the procurement can happen. Afterall, Indonesia Armed Forces is quite notorius on changing their procurement strategies. Heck, personally I really doubt there are solid long term strategies, since everything can change mid way.