Unknown icon on fields

[Fabio Pagano]

In the report design i see sometimes a strange icon in the lower left of the field:



It seems to happen when the field comes from a copy of another field made with CTRL + drag/drop.

What this icon means?

Moreover i'm just having problems with fields with this icon, often they are not printed.

Thank you.

[Brendan]

It means there's a Condition attached to the component

[Fabio Pagano]

Thank you.