The Balanced Budget Act of 1997, enacted August 5, 1997, required the per-beneficiary limitations be established by April 1, 1998.
The Balanced Budget Act of 1997 was established in April 1998. 
mnli hypothesis: The Balanced Budget Act of 1997 was established in April 1998.  premise: The Balanced Budget Act of 1997, enacted August 5, 1997, required the per-beneficiary limitations be established by April 1, 1998.