Error converting varchar to numeric (but there's no number) - oracle

Question

I have a table with several columns, like this:
CREATE TABLE CRM.INFO_ADICIONAL
(
ID_INFO_ADICIONAL NUMBER(10) NOT NULL,
NOMBRE VARCHAR2(100 BYTE) NOT NULL,
OBLIGATORIO NUMBER(1) NOT NULL,
TIPO_DATO VARCHAR2(2 BYTE) NOT NULL,
ACTIVO NUMBER(1) NOT NULL,
ID_TIPO_REQUERIMIENTO NUMBER(10) NOT NULL,
ID_USUARIO_AUDIT NUMBER(10) NOT NULL,
ORDEN NUMBER(3) DEFAULT 1,
RECHAZO_POR_NO NUMBER(1),
ID_TIPO_ARCHIVO_ADJUNTO NUMBER(10),
SOLICITAR_EN VARCHAR2(30 BYTE),
ID_CONSULTA NUMBER(10),
COMBO_ID VARCHAR2(40 BYTE),
APLICAR_COMO_VENC NUMBER(1),
MODIFICABLE NUMBER(1) DEFAULT 0,
ID_AREA_GESTION NUMBER(10),
ID_TAREA NUMBER(10)
)
The "COMBO_ID" column is the target. It is defined as VARCHAR, but when I'm trying to insert a row, TOAD displays
"ORA-06502: PL/SQL: error : error de conversión de carácter a número
numérico o de valor"
Or a 'numeric conversion error', in english.
This table have some pre-existing data, and I even found some rows including values at COMBO_ID column, all of them being VARCHAR, i.e.:
NACION (Nation), SEXO (Sex), etc
I tried a few simple SELECT statements
SELECT
ID_INFO_ADICIONAL,
NOMBRE,
OBLIGATORIO,
TIPO_DATO,
ACTIVO,
ID_TIPO_REQUERIMIENTO,
ID_USUARIO_AUDIT,
ORDEN,
RECHAZO_POR_NO,
ID_TIPO_ARCHIVO_ADJUNTO,
SOLICITAR_EN,
COMBO_ID,
APLICAR_COMO_VENC,
ID_CONSULTA,
MODIFICABLE,
ID_AREA_GESTION,
ID_TAREA
INTO
pRegistro
FROM
crm.info_adicional
where pRegistro is declared as
pRegistro INFO_ADICIONAL%ROWTYPE;
Again, I'm still getting this 'numeric conversion error'.
But, wait, if I hardcode the SELECT value in COMBO_ID column with a NUMBER:
SELECT
--other columns
123456 COMBO_ID,
--other columns
INTO
pRegistro
FROM
crm.info_adicional
It works, what the heck, it's defined as VARCHAR.
If I do the same but harcoding a string, it fails to execute again
Already tried in my DEV environment, and it's working fine.
I'm not a pro in Oracle, but I feel pretty lost.
Could it be that tables get "confused"?
Any clues?

Answer 1

That error can also be raised if you try to push a character string that is longer than your VARCHAR2's capacity (40 in your case).
Try to check if all the data you are trying to insert is correct :
SELECT
COMBO_ID
FROM
crm.info_adicional
ORDER BY length(COMBO_ID) desc;
That would also explain why it works fine on your DEV environment which, I suppose, has different data.

Answer 2

Okay, I already found the answer.
Quoting Oracle Documentation:
The %ROWTYPE attribute provides a record type that represents a row in a table or view. Columns in a row and corresponding fields in a record have the same names and datatypes.
So, basically, the SELECT statement needed to be in the same order as the table columns definition.
In my case, I had a few columns (including COMBO_ID) in a different order.
Tried, re-ordering, and works like a charm.
Thank you all for the support.