It is understood that the eight-member Commission has called-off its visit citing "technical and procedural issues".
Last week, prosecutors had informed an anti-terrorism court in Islamabad conducting the trial of the seven suspects that an Indian government letter dated August 23 had stated that the Pakistani judicial commission could visit Mumbai during September 5-6.
"The commission will leave on September 7 for Delhi and it will need at least four days to cross-examine the four witnesses (in Mumbai)," Riaz Akram Cheema, part of the team defending the accused, had told the court.
The Commission repeatedly failed to keep its dates in the past and with cancellation of the latest proposed visit, the on-going trial of seven suspects in that country will suffer further delay.
In past, the report submitted by the panel after its first visit in March 2012 was rejected by an anti-terrorism court as the commission's members were not allowed to cross- examine witnesses.