Redefinition error when exceeding array size

i am controlling a touchpanel via spi, communication works fine.

Defining the buffers for RX and TX like :

uint16 TX_DataMaster[16];
uint16 RX_DataMaster[16];

works but when the array size exceeds the value of 16 the compiler returns an error like....

Description Resource Path Location Type
#10056 symbol "TX_DataMaster" redefined: first defined in "./source/spi_DPP-CT1060A.obj"; redefined in "./source/sys_main.obj"	DPP-CT1060A	C/C++ Problem

Include guards are used, too! 

This is the header:

/*
_____HEADER____
#####################################
Display Driver
Demmel Products CT1060A - Binary Mode
Interface: SPI
Jan Scharnweber - 2014
#####################################
*/
//
/*##### Current SPI Settings#####
 * Wdelay: 0
 * Charlen: 8 Bit (using binary mode)
 * VCLK1: 100 MHz
 * Prescale: 255
 * Baudrate: 390.625 KHz
 * MSB first
 * Wait for enable: no
 * Parity: no
 * Clock Phase: 0
 * Clock Polarity : 0
 * SPI Mode 0 Master
 *
 */

// Queue length: 127Byte (127 + <CID>)
// Format: <CID> Comand 1 Command X

// always wait for ACK from TouchPanel
// no syntax check is provided


//Includes
/*ToDo:
- implement include guards
-
*/

#ifndef SPI_DPP_CT1060A_
#define SPI_DPP_CT1060A_

#include "sys_common.h"

#include "spi.h"
#include "stdio.h"
#include "utils.h"

/*Flags*/
static bool fDISP_RX_READY = false;
static bool fDISP_TX_READY = false;

/*Header and Trailer*/
#define ACK 0x06 	// Acknowledgment
#define NACK 0x15 	// Negative Acknowledgment


spiDAT1_t dataconfig1_t; // SPI config (also see HCG Settings)
uint16 TX_DataMaster[17]; // SP transmitting buffer
uint16 RX_DataMaster[1]; // SP receiving buffer

/*Functions*/

void DISP_InitSPI(void);

bool DISP_CheckStatController(spiBASE_t* spiPort);

void DISP_SendByte(uint16* byteToSend);

bool DISP_SendCommand(unsigned char *buf, unsigned char length);
/**/

#endif // _SPI_DPP_CT1060A_

Both array are defined only ONCE!

What am i doing wrong??

Thanks

Jan