Making wildcards work in a variable MySQL Stored Procedure - mysql

Question

I wrote a Stored Procedure, that uses a variable with the sql query to make it dynamic depending on a set of parameters, my problem is when I try the LIKE clause with % wildcards, the query is not filtering, I tested with a regular query and it works.
CREATE DEFINER=`root`#`localhost` PROCEDURE `seleccionar_exp_repGral`(in p_fecha date, in p_fecha2 date, in p_compania int, in p_institucion int, in p_sector int,
in p_clasificacion int, in p_analista int, in p_decision int, in p_fuenteFinanciamiento int, in p_tipo int, in p_objeto varchar(3500))
BEGIN
set #qrystr = "select Expe.exp, Expe.mes, Expe.anio, Expe.fecha_recibido, cia.nombre_com, inst.nombre_inst, Expe.monto_egreso,
Expe.anio_egreso, Expe.monto_ingreso, Expe.anio_ingreso, an.nombre_ana, deci.nombre_dec, Expe.fecha_sesion, sec.nombre_sec,
clas.nombre_cla, finan.nombre_fin, tipo.nombre_tipo from expediente Expe
left outer join compania cia on (Expe.compania = cia.idcompania)
left outer join institucion inst on (Expe.institucion = inst.idinstitucion)
left outer join analista an on (Expe.analista = an.idanalista)
left outer join decision deci on (Expe.decision = deci.iddecision)
left outer join sector sec on (Expe.sector = idsector)
left outer join clasificacion clas on (Expe.clasificacion = idclasificacion)
left outer join financiamiento finan on (Expe.financiamiento = finan.idfinanciamiento)
left outer join tipo_expediente tipo on (Expe.tipo = tipo.idtipo_expediente)";
-- variables for filter
set #pcia = p_compania;
set #pinst = p_institucion;
set #psector = p_sector;
set #pclasificacion = p_clasificacion;
set #panalista = p_analista;
set #pdecision = p_decision;
set #pfuenteFinanciamiento = p_fuenteFinanciamiento;
set #ptipo = p_tipo;
set #pObjeto = p_objeto;
-- concatenate conditions for filter
set #qrystr = CONCAT(#qrystr,'where Expe.fecha_recibido >=\'',p_fecha,'\' and Expe.fecha_recibido <=\'',p_fecha2,
'\'');
-- Filters
IF #pcia > 0 THEN
set #qrystr = CONCAT(#qrystr,' and Expe.compania = ',#pcia);
end if;
IF #pinst > 0 THEN
set #qrystr = CONCAT(#qrystr,' and Expe.institucion = ',#pinst);
end if;
IF #psector > 0 THEN
set #qrystr = CONCAT(#qrystr,' and Expe.sector = ',#psector);
end if;
IF #pclasificacion > 0 THEN
set #qrystr = CONCAT(#qrystr,' and Expe.clasificacion = ',#pclasificacion);
end if;
IF #panalista > 0 THEN
set #qrystr = CONCAT(#qrystr,' and Expe.analista = ',#panalista);
end if;
IF #pdecision > 0 THEN
set #qrystr = CONCAT(#qrystr,' and Expe.decision = ',#pdecision);
end if;
IF #pfuenteFinanciamiento > 0 THEN
set #qrystr = CONCAT(#qrystr,' and Expe.financiamiento = ',#pfuenteFinanciamiento);
end if;
IF #ptipo > 0 THEN
set #qrystr = CONCAT(#qrystr,' and Expe.tipo = ',#ptipo);
end if;
IF #pObjeto <> "" THEN
set #qrtystr = CONCAT(#qrystr," and Expe.objeto LIKE '",#pObjeto,"'");
end if;
-- preparamos el ultimo statement del query
set #qrystr = CONCAT(#qrystr,' order by Expe.idexpediente asc');
-- preparamos datos finales
PREPARE stmt from #qrystr;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END$$
From that long SP I have this part:
IF #pObjeto <> "" THEN
set #qrtystr = CONCAT(#qrystr," and Expe.objeto LIKE '",#pObjeto,"'");
end if;
This line I added the wildcard % before the #pObjeto and after that and it's not working, I even added wildcard to the variable, and my query still shows all registers without the text filtering.
I wonder if it has to do with string formatting or something.
I appreciate any help.