Wrong column sequence in IF_FPM_GUIBB_TREE

Dear All,

we built a dynamic Tree UIBB to manage hierarchy data and I am facing the issue that some columns appear in the wrong sequence in the UI.

IF_FPM_GUIBB_TREE~GET_DEFINITION

The sequence of the generated EO_FIELD_CATALOG is in the correct sequence.

IF_FPM_GUIBB_TREE~GET_DEFAULT_CONFIG

The columns are added within a LOOP by incrementing an index and calling io_layout_config->add_column(). And if I check the columns via io_layout_config->get_columns() after adding all columns, they are still in the correct sequence.

Does anyone know how and where the sequence might be changed/overwritten?