Prerequisites - Setting Up the UDA

For an element to support delta publishing, a specific UDA named :GATLASTPUBLISHTIMES must be defined on that element or on one of its ancestor elements in the AVEVA Engineering or E3D project hierarchy.

UDA Specification

The UDA must be defined on element types that are ancestors (or the element itself) of the elements you intend to publish in delta mode. The following examples show which element types require the UDA for common publish contexts:

UDA Value Format

The :GATLASTPUBLISHTIMES UDA stores an array of strings. Each string records the configuration and the date and time of the last successful publish using that configuration.

The format of each string is:

<configuration GUID>;<YYYY><MM><dd><HH><mm>

For example:

a1b2c3d4-e5f6-7890-abcd-ef1234567890;202504171430

Note: All date and time values stored in :GATLASTPUBLISHTIMES use UTC.

The gateway reads and updates this UDA automatically during publish runs. Project administrators do not need to manage UDA values manually.