@abertnamanya The Immunization resource is built as a series of Obs based on the CIEL:1421 – Immunization History concept. So you install will need to have concepts mapped the SAME-AS CIEL:1421, CIEL:984 (type of immunization), and CIEL:1410 (date of vaccination). IIRC the other concepts in the metadata @mozzy provided aren’t required but are nice-to-haves.