http://www.microsoftproject.ru/articles.phtml?aid=38#
Table Columns Notes
MSP_NUMBER_FIELDS PROJ_ID Refers to a valid ID in the MSP_PROJECTS table.
NUM_CATEGORY Indicates whether the custom number category is Task (0), Resource (1), or Assignment (3).
NUM_REF_UID Refers to a valid TASK_UID, RES_UID, or ASSN_UID in its respective table, as determined by NUM_CATEGORY.
NUM_FIELD_ID Refers to a valid CONV_VALUE in the MSP_CONVERSIONS table.
NUM_VALUE The value of the custom number field.
MSP_PROJECTS PROJ_EXT_EDITED Must be set to 1 for Project to process.
PROJ_EXT_EDITED_NUM Must be set to 1 for Project to process.