Order position to assign to the next transaction added to the wallet.
Declared in <wallet/wallet.h>
[[guarded_by(0x7f2e1e5975a8), guarded_by(0x7f2e11aa8368), guarded_by(0x7f2e169fe158), guarded_by(0x7f2e15f2d5f8), guarded_by(0x7f2e12c6c288)]]
int64_t nOrderPosNext = 0;