...

1. Go to Company Parameters and create a new one.
2. Fill in the mandatory fields in the PP table.
   As 'Table Type' select JSON; as 'Value Type' select JSON or JSON2 depending on whether you want to have one or two key columns.
3. Select the newly added PP and proceed to the right pane with Company Parameters Values.
4. Click the table header and select 'Customize Attribute Extensions' from the context menu.
   
5. In the popup dialog create new columns. 
   
6. Close the dialog. (Your entries will be saved.)
7. To see the new columns in the Company Parameter Values table, click elsewhere in the table (e.g. a different Company Parameter). 
8. Go back to your Company Parameter and the table on the right will be updated. 
9. Add the Company Parameters values in the table. 
   

Examples

As mentioned above, all special columns are saved in one column called "attributeExtension".

• For the JSON table, the key is the column "name". 
• For JSON2, there are two keys "key1" and "key2".

Fetch

Querying data is similar to a Company Parameter table. 

...

def filter = Filter.and(Filter.equal('key1', key1),Filter.equal('key2',key2)

Insert

Inserting values needs more steps. Since all special columns are saved into one, it is necessary to join them in a map first and save this map. 

...