definition when a unit definition is u201c released u201d its definition is protected from further modification when the unit definition is not u201c released u201d its definition is modifiable but a record of the explanation for the change is maintained table xviii defines the fields for tblunitequip 300 table xviii fields of table tblunitequip field name field type field description idunitequip counter a unique identifier of the unit idequiptype long integer selected from tlkplocdesc 202 to select an equipment location definition equipcfgno integer selected from tlkplocdesc 202 to identify a set of location definitions serialnumber text a serial number for a specific unit instance text any text describing a different version of the same serialnumber unit description text a description of the unit funcdwgpath text the name of a file or set of files containing the illustration of the functional block diagram for the unit cm_mstrkey long integer link to tblcm_status 210 and tblcm_memo 212 defining the group of configuration management records for a unit cm_curkey long integer link to tblcm_status 210 and tblcm_memo 212 defining the current configuration management records for an unit status long integer the current configuration status either u201c released u201d u201c unreleased u201d or u201c in process u201d released is used to write protect the unit definition unit definition data table tblunitpartslist 302 contains a list of parts selected from tlkppartslist 102 parts may be added to the list in groups by selecting kits from data lookup table tlkpkitdef 104 each part is.