File, Group, and Component Attributes: http://www.keil.com/support/man/docs/uv4/uv4_ca_filegrp_att.htm
The little red "No Entry" symbol is supposed to indicate, "Items excluded from the target and linkage"
If I manually exclude an item from just one Target, the symbol is still displayed in other Targets from which the item is not excluded!
This is misleading and, thus, unhelpful!
Hi Andrew,
we are not able to replicate the effect that you are describing. So there must be other conditions that make this appear.
Can you describe it a bit more? Does it happen with any example projects?