Oracle PL/SQL: numeric or value error - oracle

Question

The problem I have is that in a loop I get the numeric or value error for using NUMBER's. The test data im using for LR_UPDATE_ROWS consists of 2 elements currently. Both are of the NUMBER type. The type of LR_UPDATE_ROWS itself is a PL/SQL table type, which consist of a NUMBER(3,0) column.
The code is as follows:
DBMS_OUTPUT.PUT_LINE(LR_UPDATED_ROWS.FIRST); /* Prints out 1 */
DBMS_OUTPUT.PUT_LINE(LR_UPDATED_ROWS.LAST); /* Prints out 2 */
a := LR_UPDATED_ROWS.FIRST; /* Assignment works */
b := LR_UPDATED_ROWS.LAST; /* Assignment works */
DBMS_OUTPUT.PUT_LINE(a); /* Prints out 1 */
DBMS_OUTPUT.PUT_LINE(b); /* Prints out 2 */
IF LR_UPDATED_ROWS IS NOT NULL THEN
IF LR_UPDATED_ROWS.FIRST = 1 AND LR_UPDATED_ROWS.LAST = 1 THEN
lv_rows_lst:=lv_rows_lst||','||LR_UPDATED_ROWS(1);
ELSE
FOR I IN LR_UPDATED_ROWS.FIRST..LR_UPDATED_ROWS.LAST
LOOP
lv_rows_lst:=lv_rows_lst||','||LR_UPDATED_ROWS(I);
END LOOP;
END IF;
lv_rows_lst:=SUBSTR(lv_rows_lst,2,LENGTH(lv_rows_lst));
OPEN LS_CUR FOR 'SELECT * FROM DOCUMENT_QUEUE DQ WHERE DQ.ENV_ID IN ('||lv_rows_lst||')';
ELSE
LS_CUR := LS_CUR;
END IF;
The row: „FOR I IN LR_UPDATED_ROWS.FIRST..LR_UPDATED_ROWS.LAST“ gives me the error:"PL/SQL: numeric or value error“.
All that my research from the web revealed about this error was that it was some sort of conversion or number size incompatibility error. Unfortunately I have been unable to understand in which way.
All help and hints are appreciated.

Answer 1

Try this.
DBMS_OUTPUT.PUT_LINE(LR_UPDATED_ROWS.FIRST);
/* Prints out 1 */
DBMS_OUTPUT.PUT_LINE(LR_UPDATED_ROWS.LAST);
/* Prints out 2 */
a := LR_UPDATED_ROWS.FIRST;
/* Assignment works */
b := LR_UPDATED_ROWS.LAST;
/* Assignment works */
DBMS_OUTPUT.PUT_LINE(a);
/* Prints out 1 */
DBMS_OUTPUT.PUT_LINE(b);
/* Prints out 2 */
IF LR_UPDATED_ROWS.EXISTS(1) THEN
/* Still not getting the use of this piece of code */
IF LR_UPDATED_ROWS.FIRST = 1 AND LR_UPDATED_ROWS.LAST = 1 THEN
lv_rows_lst :='SELECT COLUMN_VALUE FROM TABLE(LR_UPDATED_ROWS)';
ELSE
FOR I IN LR_UPDATED_ROWS.FIRST..LR_UPDATED_ROWS.LAST
LOOP
lv_rows_lst:=lv_rows_lst||','||LR_UPDATED_ROWS(I);
END LOOP;
END IF;
lv_rows_lst:=SUBSTR(lv_rows_lst,2,LENGTH(lv_rows_lst));
OPEN LS_CUR FOR 'SELECT * FROM DOCUMENT_QUEUE DQ WHERE DQ.ENV_ID IN ('||lv_rows_lst||')';
ELSE
LS_CUR := LS_CUR;
END IF;