This limit is only applicable if you manage T-Cheks on this portal, otherwise it can be set to as 0.
This is used to bypass maximum Tchek limit in case your customer is in emergency. For example if customer has $200 as Tchek limit and it has already used $200 but needs more Tchek for emergency, then if this flag is set then you will be able issue one more Tchek equal to the amount set as TCheck limit. In other words it doubles maximum Tchek limit for one day.