A Dimension Set Entry is one dimension code and value inside a dimension set, the combination a line or entry points to through its Dimension Set ID.
A dimension set entry is a single line of a dimension set: one dimension code with its value. A dimension set is the full combination of dimensions used on a document line, a journal line or a posted entry. Business Central stores each unique combination once, gives it a Dimension Set ID, and lets lines and entries reference that ID instead of repeating the values.
You rarely open the underlying data by name. On a document line, a journal line or a posted entry, use the Dimensions action to see the dimension set entries behind it. On lines that are not yet posted the values can be edited, which creates a new set or reuses an existing one. Pressing Alt+Q and searching for Dimensions gives the list of dimension codes themselves, which is a different thing.
A sales order line carries Dimension Set ID 1247, which holds two dimension set entries: DEPARTMENT with value SALES and PROJECT with value P-2026-014. A second line with exactly the same combination points to the same ID 1247. If a user adds AREA with value WEST on one of the lines, Business Central creates a new set, for example ID 1893, and only that line references it.
Users often try to edit dimensions on a posted entry and find the values read only. For posted general ledger entries there is a way out: select the entries and run the Correct Dimensions action, which creates a dimension correction that reassigns the dimension set and can be validated, run and later undone as its own job, with no reversal. Customer, vendor and item ledger entries are not covered by that tool, so there a correction still means reversing the posting and posting again. Another source of confusion is analysis that seems to lose data after a dimension is introduced mid year: older entries simply do not contain that dimension, so they group under a blank value.
When you export data for reporting, remember that lines and entries carry a Dimension Set ID rather than dimension columns, so any dataset has to resolve the set into its entries. Standard financial reports and dimension analysis do that resolution for you, which is usually safer than rebuilding the join by hand in a spreadsheet.
For general ledger entries, yes. Select the entries, run Correct Dimensions, and Business Central creates a dimension correction you can validate, run and later undo. Customer, vendor and item ledger entries are not covered, so there the usual fix is to reverse the posting and post again with the right values.
Because they use exactly the same dimension codes and values. Business Central stores each unique combination once and reuses it.
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