Hi vijay,
To do the init dtp and delta. pls follow the below steps.
1.at dtp extraction tab, extraction mode - delta.
2. at execute tab, processing mode- No data transfer, delta status in source; Fetched
3. once you done 1 and steps. just trigger your dtp, it fetch 0records. mean init was success.
4. Change your dtp settings again at Execute tab, Processing mode : Serial extraction, immediately parallel processing (mean now your delta was set, next load onwards it pulls delta records form psa)
5. You can delta dtp continuously
Thanks