Report reasons

Element details in the report groups the elements by outcome, then by reason. This is the complete list, as the report words it.

Settled — not a problem

Listed apart, on one gray line under the bar; nothing to do.

Reason	Meaning
Value already set	The parameter already held exactly this value
Existing value kept	Only if empty was on and the parameter was filled
No row matches, left unchanged as set	Map Values found no row and If no row matches is Leave unchanged
Not placed in the model (library element)	A type nobody placed: there is no instance to read from

Set

Reason	Meaning
(none)	Written
Nothing found, fallback value written	No room, space, area, level, grid or table row was found, and the "if not found" text was written instead

Excluded or read-only

These carry no reason, only a status:

Status	Meaning
Busy	Another user owns the element (with Skip elements edited by others)
Read-only	The target parameter cannot be written (reported this way by Find & Replace and Map Values)
In group / In assembly / Pinned	Skipped by the matching Exclusions option

Could not apply

The operation had nothing it could write to this element.

Reason	Meaning	What to do
Parameter not found	The element has no parameter of that name	Bind the parameter to the category; check the name and Instance/Type
Target parameter is read-only	Revit computes this parameter	Choose another target
Target type not supported	The target cannot hold what the operation writes — e.g. text into a material	Choose a text or number parameter
Yes/No or Integer cannot be cleared	A clear was asked for, but these types have no empty value	Write `0`/`No` instead, or use a text parameter
Source value is empty	The parameter to read from is empty on this element	Fill the source first, or accept it
Nothing found where the element is	No room, space, area or level at the element's position	See Room, Space or Area Data writes nothing
Element has no location	No point or line to measure from (Location Data, Nearest Grids)	Expected for some categories
Element has no direction	No facing direction to read (Location Data)	Try another Direction from
Not a door or window	Which room is set to a door/window side, and this is another category	Expected; narrow the categories
No row matches	Map Values found no row, and If no row matches is not Leave unchanged	Add the row, or check case and spaces
Workset not found or not unique	The Move to Workset rule matches no workset or several	Make the rule match exactly one
No nested elements	Push to Nested: the family has no shared nested families	Expected
Nested type: parents push different values	Two parents give the same nested type different values	Write to an instance parameter instead
Type: its instances give different values	The target is a type parameter and its instances disagree	See A type parameter keeps its old value
No Area Scheme chosen / No Area Scheme in the document	Area Data has no scheme to read	Fill Area Scheme
Member of a model group	Revit does not allow this change inside a group	Edit the group, or exclude groups

Unchanged

Reason	Meaning
Left unchanged by the operation	The rules said so — an If Then Else branch set to Leave unchanged, an empty Map Values cell
Workset follows the parent family	A nested component always sits on its parent's workset

Failed

Revit refused the write.

Reason	Meaning	What to do
Value does not fit the type	Text into a number, a word into a Yes/No	See Value does not fit the type
Revit refused the value	Revit rejected the value for its own reasons	Check the value against the parameter in Revit
Revit rolled back the change	Revit undid the transaction the write was made in, so the value never reached the model	Look at the element in Revit, then run again
Broken connection in the model	A pipe or fitting Revit flags as disconnected	See Pipes and fittings with broken connections
Regex took too long on this value	A regular expression needed more than two seconds	Simplify the pattern
No number left: past 2147483647	Unique Identifier ran out of numbers	Lower Start or Step