Link rule components

To create a link rule, specify the data sets to reconcile and create clauses that specify the objects and attributes to evaluate when you run the reconciliation.

Link rules use unique identifiers to establish a link between objects. The attribute most commonly used to link assets and deployed assets is a serial number or asset tag. The attribute most commonly used to link configuration items (CIs) with actual CIs is ACTCINUM, the actual CI number.

A link rule consists of the following components:

Link rule clause requirements

To create link rules, you create clauses that specify how to link objects. Clauses must be valid expressions. If a clause is not valid, an error message is displayed, and the link rule is not saved. When you save a link rule, the following rules determine whether clauses are valid expressions:
  • Each open parenthesis must have a corresponding close parenthesis.
  • The number in the Sequence field must be unique. Sequence numbers are automatically generated in increments of ten. You can also specify numbers manually. If you enter sequence numbers in random order, the clauses are sorted and displayed in ascending numeric order when you save the record.
  • All rows except the row with the highest sequence number must have a value specified in the Sequence Operator field.
  • The row with the highest sequence number must not have a sequence operator (After the clauses are sorted, this is the last row in the table window).


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