Storing multiple data entities in single transaction

I have one form in that  i have to store data into 4 CDTS .Project ,projectteaam,milestone,milestonetask,

={{entity:pv!DSR_Project, data:{pv!DSR_Project.projectname,pv!DSR_Project.roleid,pv!DSR_Project.clientid,pv!DSR_Project.estimatedbudget,pv!DSR_Project.projectstartdate,pv!DSR_Project.projectenddate,pv!DSR_Project.description}},{entity:pv!DSR_ProjectTeam, data:{pv!DSR_ProjectTeam.projectid,pv!DSR_ProjectTeam.employeeid,pv!DSR_ProjectTeam.startdate,pv!DSR_ProjectTeam.enddate,pv!DSR_ProjectTeam.description}},{entity:pv!DSR_MileStone, data:{pv!DSR_MileStone.projectid,pv!DSR_MileStone.milestonename,pv!DSR_MileStone.startdate,pv!DSR_MileStone.baseline,pv!DSR_MileStone.forcast,pv!DSR_MileStone.actual,pv!DSR_MileStone.estamount,pv!DSR_MileStone.actualamount,pv!DSR_MileStone.comments,pv!DSR_MileStone.paymentrecieveddate}},{entity:pv!DSR_MileStoneTask, data:{pv!DSR_MileStoneTask.milestoneid,pv!DSR_MileStoneTask.taskname,pv!DSR_MileStoneTask.taskhour}}}

can any one help me out of this .I need to store data in multiple data store entities.since im unable to store 

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