Oracle Message PLS-01905 - : character string buffer too small

ERROR: character string buffer too small
CAUSEAn error was encountered while moving a character string from a source to a destination. This error occurs if, for example, an attempt is made to move a a character string of 10 characters into a 1 character buffer. The cause of this error may not always be obvious. For example, the following will result in this error: a varchar2(1); b number; b : = 10; a : = b; An error results because an implicit conversion causes the number 10 to become the character string 10, which does not fit in the character buffer of 1 allocated for the variable a.
ACTIONFirst, look for character string assignment statements where the buffer size is mismatched. If there are none found, then consider the implicit conversion case illustrated in the example above.