Itemlist in Opportunity not appear after create

[Brian]

Dear Victor,
Sorry for distube you again.
Because I'm old user using old version and not upgrade for long time.
Could you help to clear...

[Brian]

Dear Victor,
One more querry:
How about advance pack?
Do I need to upgrade accordingly ?
Since If it is not required then I will...

[Brian]

Hi,
I have an issue with item list in Opportunity :
1. I create Opportunity, add item list (Opportunity item) then save.
2. After that:...