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why SCP need to send DP in its RRBE message to SSF

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scriptor
why SCP need to send DP in its RRBE message to SSF

hi

my question here is why do SCP need to send DPs(DP4,DP5,DP6,DP7,DP9, DP10) in RRBE message to MSC ,
when MSC itself tell to SCP as which DP is trigger in ERB message

SSF------IDP2--------> SCP

SSF<-----DP4,DP5,DP6,DP7,DP9,DP10--SCP (RRBE message)

SSF-------DP7-->SCP (ERB Messgae)