The explanations in the manual for 'Lift after payment' and 'Fee limit' in Patron restriction types could be more clearly written. Currently, they read:

<Lift after payment: if set to ‘Yes’, restrictions using this type will be automatically lifted after payments equal to or exceeding the amount defined in ‘Fee Limit’.

Fee Limit: enter the amount that must be paid in order to lift a restriction of this type. This field is only used if ‘Lift after payment’ is set to ‘Yes’.>

The descriptions for both make it sound as if Koha is looking at the amount paid, but they actually refer to the remaining balance after payment. 

'Lift after payment' could read "if set to yes, restrictions using this type will be automatically lifted if the patron's remaining balance after payment is equal to or below the amount defined in 'Fee limit'."

'Fee limit' could read "enter the amount down to which patrons must pay their balance in order to lift a restriction of this type. If the patron's balance is equal to or below this amount, the restriction will be lifted. This field is only used if ‘Lift after payment’ is set to ‘Yes’."