C initializer element is not constant - pointers in struct - c

Question

Code snippets appear below
/// System Parameters for the gateway
typedef struct {
bool mobile_gateway; // true = GPS receiver used, else false
uint16_t gw_ordinal_number; // Starting at 1, the ordinal gateway number
} CONFIG_SYSTEM_PARMS;
// Data types for the system parameters
typedef enum {
CFGPARM_TYPE_BOOL,
CFGPARM_TYPE_UINT,
CFGPARM_TYPE_INT,
CFGPARM_TYPE_DOUBLE,
CFGPARM_NUM_TYPES
} CONFIG_PARM_DATA_TYPES;
// These mnemonic names and data types correspond to the system parameters
#define SYS_PARM_MOBILE_GATEWAY_MNEM "MOBILEGW"
#define SYS_PARM_GATEWAY_NUMBER_MNEM "GWNUM"
#define SYS_PARM_MOBILE_GATEWAY_TYPE CFGPARM_TYPE_BOOL
#define SYS_PARM_GATEWAY_NUMBER_TYPE CFGPARM_TYPE_UINT
typedef struct {
char FILLER; // TODO - Define User Parms later...
} CONFIG_USER_PARMS;
static const uint16_t TOTAL_CONFIG_PARM_BYTESIZE = sizeof(CONFIG_SYSTEM_PARMS) + sizeof(CONFIG_USER_PARMS);
typedef struct {
const char *sysparm_mnemonic;
CONFIG_PARM_DATA_TYPES sysparm_data_type;
void *sysparm_data_ptr;
} CONFIG_PARM_LOOKUP_TABLE;
// ****************************************
static LT_LOGGER_DATA gateway_log_data;
static CONFIG_SYSTEM_PARMS *config_sys_parms_ptr = &gateway_log_data.config_system_parms;
// **************************************************
// Lookup table for the System Parms
//
// CAA: This is a stinking mess - There is no easy way to define &gateway_log_data.config_system_parms
// outside of the following initialization, so the result is more verbose than it should be
static const CONFIG_PARM_LOOKUP_TABLE config_parm_lookup_table[] = {
{ SYS_PARM_MOBILE_GATEWAY_MNEM, SYS_PARM_MOBILE_GATEWAY_TYPE, &config_sys_parms_ptr->mobile_gateway},
{ SYS_PARM_GATEWAY_NUMBER_MNEM, SYS_PARM_GATEWAY_NUMBER_TYPE, &gateway_log_data.config_system_parms.gw_ordinal_number},
// FILLER to mark end of list
{ "", 0, NULL}
};
The question is this:
Why, am I getting the error : initializer element is not constant (near initialization for 'config_parm_lookup_table[0].sysparm_data_ptr')
when the initializer for config_parm_lookup_table[1].sysparm_data_ptr is effectively using the same construct?
Obviously, I have a work-around, but it seems verbose.