Collection compilation erroe

Question

I am using a process which creates and loads and then updates 2 collections.
The very last step in 100 or so lines of code before an end loop/end is this line:
APEX_COLLECTION.UPDATE_MEMBER_ATTRIBUTE (tip, seqnum, days, thetip);
which gives this error
ORA-06550: line 112, column 5: PLS-00307: too many declarations of 'UPDATE_MEMBER_ATTRIBUTE' match this call ORA-06550:
I have updated another collection with an identical structure (but different name) earlier in the loop, using the same syntax without a problem
Variables are defined thus:
tip varchar2(20) := 'TOOLTIP';
thetip varchar2(400);
day INTEGER;
seqnum INTEGER;
Previously I had only 1 collection in the process and this compiled and executed perfectly; I added another collection to store tooltips for each cell, and now I have this compilation error, which I cannot make sense of.
Any ideas?
Regards
CS

Answer 1

Sorry Andy, that was a typo; the variable was declared correctly in the process.
Thanks a tip from Denes, the problem has been solved by using the syntax:
apex_collection.update_member_attribute (p_collection_name => occ,
p_seq => seqnum,
p_attr_number => days,
p_attr_value => r
apex_collection.update_member_attribute (p_collection_name => tip,
p_seq => seqnum,
p_attr_number => days,
p_attr_value => thetip
His theory is that it was an overloading problem. r is an integer while thetip is a varchar2; anyway at least it parses properly now.
Thanks all!
CS