Attachment Functionality into your Custom Application | Maximo

1. Drag the attachment control in Application Designer
2. create a RELATIONSHIP to DOCLINK OBJECT

Application Name: Custom_App
Relationship: DOCLINKS
child Object: DOCLINKS
Where Clause: ownertable='Custom_App' and ownerid=:Custom_AppID

3. Enlist you custom application in APPDOCTYPE table, for that run this insert statement

INSERT INTO MAXIMO.APPDOCTYPE (APP, DOCTYPE, APPDOCTYPEID) VALUES ('Custom_App', 'Attachments', (NEXT VALUE FOR MAXIMO.APPDOCTYPESEQ));