Hi Rajesh,
You need to use EXT kernel . Please check in PAM to find the compatible kernel for Netweaver 7.3 EHP1 .
I could see that following kernel versions are compatible with netweaver 731
SAP KERNEL 7.20 EXT,
SAP KERNEL 7.21 EXT
SAP KERNEL 7.22 EXT
Please refer the SAP note #1591607.
You should also use higher version of tp and see if it helps.