Price bargainings.
There is not a single purchase not bargained indefinitely by you. After that you are crying for delay... see F404 engine purchase (et least not a french exemple...)
It's called being a demanding customer. You want an example ? Here's why India & China will never be friends . From 1:34 to 5:00 .
Now are you saying you can't handle demanding customers ? Well then you've the likes of Indonesia who will sign up for a deal get you to make stuff & in the midst of it when the time comes to cough up money will go ahead & shamelessly tell you they've no money only palm oil to barter like they did the South Koreans on the submarine deal which ostensibly got cancelled.
On the other hand if you're open to such barter system SAFRAN , Thales , Dassault & the entire French aerospace ecosystem will end up trading on commodities exchange in Paris or wherever it is you trade commodities in Europe .
Don't be surprised if you see Dassault issuing employment advertisements in French dailies for aerospace engineers & traders in commodities in the same advertisement & eventually from an aerospace company morphs into a commodities trading company because hey , the margins are higher in commodities & you get to tell your grand children or great grandchildren , listen here Dassault used to make planes to their utter disbelief . You don't want that do ?
On the other hand you could go ahead & reject participation in Indian tenders forever like what Honeywell did when we were supposed to upgrade the RR Adour TFs with Honeywell & they held on to the prices for nearly 6-7 years IIRC with no response from our MoD & one fine day when MoD chose to sign the agreement Honeywell coolly informed them the price escalated by some 40% or thereabouts.
Eventually IAF scrapped plans to up engine the Jaguars & instead of upgrading some 120 Jaguars eventually decided they'd do so for only 60 nos retiring the rest. So you see neither IAF lost out nor did Honeywell except Honeywell would no longer be welcome at MoD but they've earned our respect here.
You can do so too. Otherwise you can internalize the axiom -
# The customer is always right .
## in case the customer is wrong please refer to # .