Cricket South Africa has withdrawn its interest in the Proteas touring Pakistan for three T20 internationals in March.
CSA cited the workload of the players as the reason, taking into account the fact that the Proteas will tour India next month, following the upcoming T20 series against Australia.
The planned Pakistan tour will be rescheduled after the two boards find a new window.
South Africa's tour to Pakistan did face logistical challenges and CSA was planning to send a security delegation to Pakistan next month during the PSL to assess the situation.
"We are pleased that CSA remains committed to rescheduling this short series as soon as practically possible,” said Wasim Khan, PCB CEO. "As there is a strong willingness and commitment, both the boards are now exploring their FTPs to find gaps so that we can agree on the dates."
CSA's Acting CEO Jacques Faul said: "This has purely been done because of the heavy workload and international schedule our players are facing in the immediate future. I have assured my counterpart at the PCB, Wasim Khan, that the tour remains very much on our international schedule. I would also like to stress that security was not an issue in asking the PCB for this postponement. We will now work together to find an appropriate window in the international cricket calendar."