PLS-00103遇到了符号

Question

我正在创建一个程序：

CREATE OR REPLACE PROCEDURE M4PR_GEMS_IMP_ADMISSOES([...]
    vMotivo_cambio  IN VARCHAR2,
    vFec_inicio    IN DATE)
IS
    vMotivo_cambio := 'AC'; 
    vFec_inicio := vFec_alta_empleado;
BEGIN
    [...]

我的错误：

  

PROCEDURE XEROX.M4PR_GEMS_IMP_ADMISSOES的编译错误

     

错误：PLS-00103：遇到以下任何一种情况时遇到符号“=”：

    constant exception <an identifier>
      <a double-quoted delimited-identifier> table LONG_ double ref
      char time timestamp interval date binary national character
      nchar
   The symbol "<an identifier>" was substituted for "=" to continue.

     

线：58   文字：vMotivo_cambio：='AC';

     

错误：PLS-00103：遇到以下任何一种情况时遇到符号“=”：

     constant exception <an identifier>
      <a double-quoted delimited-identifier> table LONG_ double ref
      char time timestamp interval date binary national character
      nchar
   The symbol "<an identifier>" was substituted for "=" to continue.

     

线：59   文字：vFec_inicio：= vFec_alta_empleado;