OPM Costing Issues ( GL Expense Allocation, SLA Setup)

Hi, i'm new to OPM Costing, i have couple of questions:

1. I need to know exactly the SLA Events that need to be overwritten in OPM SLA Setup - because every time i run Create Accounting in Draft Mode - the output indicates that some account combination can not be generated. - i followed these guides ( Doc ID 838293.1 , Doc ID 820144.1, Doc ID 822303.1 ) - below is a sample from Create Accounting Output.
2. On Test environment i had loaded the used account (From GL Responsibility) with certain amounts on certain period (say Dec-24) when i run the OPM Preprocessor i find the GL Expense Allocation records is 0 - so please i need to know how exactly to fetch the amounts in these accounts to be considered while running costing concurrent(s)