Problem adding data select and cross apply in a table function

Creating variable values that would then be used in a function.

I have a function that is working fine but I've added a component to initilize some data variables to use throughout the function but I'm getting the following error when try to update the (table) function.

Msg 156, Level 15, State 1, Procedure udfCheckMultiSiteOrder_20190314, Line 27 [Batch Start Line 9]
Incorrect syntax near the keyword 'WITH'.
Msg 319, Level 15, State 1, Procedure udfCheckMultiSiteOrder_20190314, Line 27 [Batch Start Line 9]
Incorrect syntax near the keyword 'with'. If this statement is a common table expression, an xmlnamespaces clause or a change tracking context clause, the previous statement must be terminated with a semicolon.

I have attached the code I'm using and have notated with todays date what I added. I'm sure it's where I'm placing the new code but not sure where to place instead.

Thanks as always.PrePMultiFuntion.txt