Dear Raju,
Answering your 1st question, There is no straight rule for number of GL, Its based on organization requirement.
Most of the organization want to account expenses on individual account for reporting purpose. Hence we need to assign different GL, How ever there is no straight rule for the same.
Answering your 2nd question, For valuation, You shall follow below steps, Incase all the customization is correct the valuation will happen without any error.
- Create contract(FTR_CREATE)
- Settle the contract(FTR_EDIT)
- Post all valued cash flows(TBB1)
- Save NPV (TPM60)
- Carrying out valuation run(TPM1)
Let me know if you need any more inputs.
Regards,
Jain