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Following restrictions are defined by the CGI to all PartyIdentification32 elements (Dbtr, UltmtDbtr, Cdtr, UltmtCdtr):
RECOMMENDATION IN ORDER OF PREFERENCE:
1: Use only structured address
When using combination of both structured address and Address Line, must use structured tags for post code (if applicable), country subdivision (if applicable), town name and country and only 2 Address Lines (to include street address)
Use only Address Line (up to 7 lines; instrument by instrument limitations may apply)
Structured element is this case means all other elements inside 'PstlAdr' other than 'AdrLine'.
Below is a screenshot of vanilla pain.001.001.03 schema to potentially help to visualize the situation: