Minus the amount for escrow that was withheld by the NBA, the 76ers had been withholding nearly $1.3 million of Simmons’ salary in each of his paycheck. That has continued since the trade to the Nets, who are made to deduct salary from Simmons’ pay to wire to the 76ers, sources said. Because Simmons’ last paycheck is on April 30, the deductions should carry over to the offseason. Once again. Simmons will receive a $8.25 million advance on July 1 and Oct. 1. The NBA’s collective bargaining agreement holds that a grievance must be initiated within 30 days from the date of the occurrence upon which the grievance is based — or within 30 days from the date when facts of the matter become known to initiate the grievance, according to the league CBA.