R/3 to ODS delta update is good but ODS to Cube delta is broken. How to fix it?

i. Check the Monitor (RSMO) what’s the error explanation. Based on explanation, we can check the reason
ii. Check the timings of delta load from R3 – ODS – CUBE if conflicting after ODS load
iii. Check the mapping of Transfer/Update Rules
iv. Fails in RFC connection
v. BW is not set as source system
vi. Dump (for a lot of reasons, full table space, time out, sql errors…) Do not receive an IDOC correctly.
vii. There is a error load before the last one and so on…