Message on the fields of a DS template

[Gaia-Florian]

Describe the bug
When I add a DS template, I always get a message on all the fields saying they are not used. In this case, it's normal

To Reproduce
Create a new source and add this code :
`dcl-ds t_FKList template;
fk_constraint_name varchar(128);
fk_table_name_o varchar(128);
fk_column_name_o varchar(128);
fk_table_name_d varchar(128);
fk_column_name_d varchar(128);
end-ds;

dcl-ds FKList likeds(t_FKList) dim(*AUTO:50);
dcl-ds w_FKList likeds(t_FKList);`

Expected behavior
Do not display the message on the fields of a DS template

Screenshots

Environment (please complete the following information):

• Extension version [e.g. 2.17.0]
• IBM i OS version [e.g. 7.6]