Dynamics NAV LS Retail - POS Inventory Lookup does not work INV_LOOKUP

Other Issues:
POS Inventory Lookup is blank
POS Inventory lookup is unresponsive
https://portal.lsretail.com/Portals/35/LS%20Nav/LS%20Nav%20Documentation/How-To%20documents/How%20to%20Set%20Up%20POS%20Inventory%20Lookup%20-%20LS%20Retail%20NAV.pdf?ver=2015-04-28-234844-327
Solution:

• Check the Retail Product Group>POS Inventory Lookup for each group
• Confirm this table is synchronizing, and is ticked on HO and POS store card
• Check the pos inventory lookup field on store card.
• Check the pos inventory lookup field on each Item category card.
• Check the inventory lookup field in the functionality profile card and select the HO distribution location.
• Check the POS Functionality Profile>POS Functionality Profile Web Servers
• Tick Local request
• Ensure all post inventory lookup options are setup for all location profiles, stores and terminals
• Run the Update POS Inventory Lookup Utility - For all stores
• Store>Actions>Update POS Inventory Lookup
• This is codeunit 99008909
• Enable the Get Inventory Lookup in Web Service Setup>Web Requests
• Edit the request xml
• Add the Level 3>Normal>Text> Location_Profile if it's missing 
• Tick optional
• Clicking the Inventory button in the POS run the POS command INV_LOOKUP
• C99001570
• C99009513 Web Services Client: GetInventoryLookup
• C99009512 WS Functions
• Schedule this to run every hour
• C99008909 LSC Pos Trans Server Utility

If all else fails,

• T99001608 UpdateInventory
• The PTsActive flag comes in True instead of False, and prevents the correct calculation of the "Phys. Inventory" field in C99001570
• Modify the code to add 

    CALCFIELDS("Calc. Phys. Inventory","Calc. Total Sales","Calc. Purch. Order.","Calc. Posted Sales",
      "Calc. Total Inv. Adjmt.","Calc. Posted Inv. Adjmt.");
    "Phys. Inventory" := "Calc. Phys. Inventory";

before the Net Inventory Line (154)