Order position to assign to the next transaction added to the wallet.
Declared in <wallet/wallet.h>
[[guarded_by(0x7fbc76bfc3b8), guarded_by(0x7fbc81b75d78), guarded_by(0x7fbc7e013bf8), guarded_by(0x7fbc7e2430a8), guarded_by(0x7fbc8e713ce8)]]
int64_t nOrderPosNext = 0;