ParseError when compile the ASN1 schema file

[CAJCAJ]

I encounter an issue:
asn1tools.parser.ParseError: Invalid ASN.1 syntax at line 4843, column 31: 'Reg-AdvisorySpeed DSRC>!<.REG-EXT-ID-AND-TYPE ::= { ... }': Expected ::=.

This line in my file is:
Reg-AdvisorySpeed DSRC.REG-EXT-ID-AND-TYPE ::= { ... }

I believe the issue is when I called the DSRC, which is another module in the same file, like this:

DSRC DEFINITIONS AUTOMATIC TAGS::=
BEGIN
REG-EXT-ID-AND-TYPE ::= CLASS {
&id RegionId UNIQUE,
&Type
} WITH SYNTAX {&Type IDENTIFIED BY &id}
END

Why it just cannot track the module name?

Actually it is a published standard asn1 file from SAE J2735 (https://www.sae.org/standards/content/j2735asn_201603/) if you are interested in looking into it.

Thanks!