CFTH13E PART=COMPRD01 FPDU Remote reject DIAGI=916 DIAGP=RCO 309

The problem is on your partner's side.

DIAGI = 916 clearly depicts :  PROT - (PeSIT only) Maximum number of transfers reached at the partner end (MAXTRANS parameter)

You tried to transfer a lot of files at a time to your partner.
The transfer entries were created successfully , temporary files were generated for transfers.
But when the transfers started  , due to limitation from your partner's MAXTRANS parameter definition ( defined in CFTPARM object ) , it failed.

Please ask your partner to modify the value of MAXTRANS , TRANTASK in his CFTPARM object definition .( See online help for further details on the parametric values of these parameters. )