GO:0035582

Confining a bone morphogenetic protein (BMP) to the extracellular matrix (ECM), such that it is separated from other components of the signaling pathway, including its cell surface receptor. Bone morphogenetic proteins (BMPs) are secreted as homodimers, non-covalently associated with N-terminal pro-peptides, and are targeted to the extracellular matrix through interaction with matrix proteins. [GOC:BHF, PMID:20855508]