If you just want to update the srcoll lists so the icons are shown, and no other stuff needs to be updated to the itemData, you could try:
Lua Code:
ZO_ScrollList_RefreshVisible(inventoryType)
"inventoryType" can be the control name of an ZO scrollist like
Player inventory: ZO_PlayerInventoryBackpack
Bank: ZO_PlayerBankBackpack
Guild Bank: ZO_GuildBankBackpack
Perhaps there is also a ZO_TradingHouseBackpack
or even one for the results list int he trading house. Check the trading house with ZGOO addon or try to check ZO_TradingHouse with ZGOO and look at the children, parent controls if you find a list to update.
Could be: ZO_TradingHouseItemPaneSearchResults