
You can edit a worklist from the FI-AA application menu to carry out mass changes, as long as you have authorization for this application transaction.
Therefore, it is not necessary to access the function with workflow task assignment in Customizing.
Note
Substitution Rule for Mass Changes

A substitution rule consists of the following parts:
Conditions that identify the records to be selected:
You can create conditions using the form editor or while in expert mode. To use expert mode, you must know the technical field and table descriptions of the input fields involved.
Substitutions if the conditions are met:
You can identify replacement values using substitutions. These substitutions can be constant values, field-field assignments, or user exits.
For more information on the use of substitution rules for mass changes to (time-dependent) asset master data, see SAP Note 210897.