Understood.
With a small amount on the purse, PRC returns the 3 parameters:
Code: 200
Error:
Errortext: “little money on the wallet, the commission will be X.XXX btc” (not exactly)
The error is written to the log and an error is displayed in the admin panel when transferring to a cold wallet, and the “error” parameter is empty.
It is solved by replenishment of a purse =)
It will be good to output the “error text” about the shortage of funds for the commission both in the admin panel and users, but this is not so.